2024 Acoustic Surveys Report for 4VWX Herring
2025-07-28
Acoustic Survey Tabs
Summary Results
Number of Surveys
Table 1. Summary of the number of surveys undertaken in 2024, and the number of surveys examined in the estimation of spawning stock biomass (SSB) for the Atlantic herring 4VWX stock and coastal component complexes. Numbers in brackets indicate the number of surveys excluded from total biomass estimates.
| Spawning Grounds | Number of Surveys | Notes |
|---|---|---|
| Offshore Banks | 0 | |
| Scots Bay | 11 | |
| German Bank | 8 | |
| Seal Island | 7 | |
| Spectacle Buoy | 4 | |
| Trinity Ledge | 4 | |
| Little Hope | 9 | 6 used |
| Eastern Shore | 5 | 5 used |
| Glace Bay | 0 | |
| Total | 48 |
Survey Dates
Table 2. Summary of completed herring acoustic surveys in 2024 with interval (days) between surveys on the same grounds, and the number of boats with acoustic systems.
| Location of Survey | Survey Date | Interval (days) | Acoustic Boats |
|---|---|---|---|
| Scots Bay #1 | 2024-05-05 | NA | 3 |
| Scots Bay #2 | 2024-05-20 | 15 | 4 |
| Scots Bay #3 | 2024-06-02 | 13 | 6 |
| Scots Bay #4 | 2024-06-16 | 14 | 6 |
| Scots Bay #5 | 2024-07-01 | 15 | 4 |
| Scots Bay #6 | 2024-07-15 | 14 | 5 |
| Scots Bay #7 | 2024-07-29 | 14 | 4 |
| Scots Bay #8 | 2024-08-11 | 13 | 4 |
| Scots Bay #9 | 2024-08-25 | 14 | 4 |
| Scots Bay #10 | 2024-09-08 | 14 | 3 |
| Scots Bay #11 | 2024-09-23 | 15 | 4 |
| Trinity Ledge #1 | 2024-08-17 | NA | 1 |
| Trinity Ledge #2 | 2024-08-27 | 10 | 1 |
| Trinity Ledge #3 | 2024-09-09 | 13 | 1 |
| Trinity Ledge #4 | 2024-09-20 | 11 | 1 |
| Spec Buoy #1 | 2024-08-17 | NA | 1 |
| Spec Buoy #2 | 2024-08-27 | 10 | 1 |
| Spec Buoy #3 | 2024-09-06 | 10 | 1 |
| Spec Buoy #4 | 2024-09-16 | 10 | 1 |
| German Bank #1 | 2024-08-04 | NA | 6 |
| German Bank #2 | 2024-08-18 | 14 | 6 |
| German Bank #3 | 2024-09-02 | 15 | 5 |
| German Bank #4 | 2024-09-15 | 13 | 6 |
| German Bank #5 | 2024-09-29 | 14 | 6 |
| German Bank #6 | 2024-10-20 | 21 | 6 |
| German Bank #7 | 2024-11-03 | 14 | 3 |
| Seal Island #1 | 2024-08-05 | NA | 6 |
| Seal Island #2 | 2024-08-19 | 14 | 6 |
| Seal Island #3 | 2024-09-03 | 15 | 5 |
| Seal Island #4 | 2024-09-16 | 13 | 6 |
| Seal Island #5 | 2024-09-30 | 14 | 6 |
| Seal Island #6 | 2024-10-21 | 21 | 7 |
| Seal Island #7 | 2024-11-04 | 14 | 2 |
| Little Hope #1 | 2024-08-16 | NA | 4 |
| Little Hope #2 | 2024-08-27 | 11 | 4 |
| Little Hope #3 | 2024-09-06 | 10 | 5 |
| Little Hope #4 | 2024-09-16 | 10 | 3 |
| Little Hope #5 | 2024-09-26 | 10 | 3 |
| Little Hope #6 | 2024-10-10 | 14 | 3 |
| Little Hope #7 | 2024-10-21 | 11 | 1 |
| Little Hope #8 | 2024-10-24 | 3 | 2 |
| Little Hope #9 | 2024-11-02 | 9 | 3 |
| Eastern Shore #1 | 2024-09-12 | NA | 1 |
| Eastern Shore #2 | 2024-09-24 | 12 | 4 |
| Eastern Shore #3 | 2024-10-04 | 10 | 3 |
| Eastern Shore #4 | 2024-10-30 | 26 | 2 |
| Eastern Shore #5 | 2024-11-04 | 5 | 1 |
SWNS/BoF Time-Series
Figure. Time series of acoustic-based spawning stock biomass for
Scots Bay, German Bank, Trinity Ledge, Spectacle Buoy, and Seal Island
spawning grounds. 95% Confidence intervals reported for Scots Bay and
German Bank only.
Figure. Acoustic index of SSB (in thousands of metric tons)
(with 95% confidence intervals; black line), the 3-year moving average
(red line), the overall average since 1999 (dashed brown line), and the
limit reference point for the SWNS/BoF spawning component (revised
2005–2010 German Bank and Scots Bay average; dashed blue line).
Scots Bay
Summary
Table. Summary of the 2024 Scots Bay spawning ground acoustic survey data and associated biomass estimates for Main Box, North Box, and East Box areas. This summary includes both systematic and ad-hoc surveys.
| Location | Date | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Unadjusted Biomass (t) | Standard Error (t) | St. Err % | Adjusted Biomass (t) |
|---|---|---|---|---|---|---|---|---|
| Scots Bay #1 | 2024-05-05 | -35.5000 | 426 | -43.74 | 67,094 | 37,035 | 58 | 67,094 |
| Scots Bay #2 | 2024-05-20 | -35.5000 | 550 | -48.63 | 28,750 | 6,866 | 26 | 20,566 |
| Scots Bay #3 | 2024-06-02 | -35.0685 | 599 | -51.54 | 61,745 | 3,716 | 28 | 57,220 |
| Scots Bay #4 | 2024-06-16 | -35.2123 | 540 | -47.59 | 32,605 | 24,230 | 78 | 23,965 |
| Scots Bay #5 | 2024-07-01 | -34.9899 | 576 | -56.25 | 4,682 | 625 | 14 | 705 |
| Scots Bay #6 | 2024-07-15 | -35.5000 | 651 | -57.25 | 4,816 | 1,348 | 31 | 4,183 |
| Scots Bay #7 | 2024-07-29 | -35.6507 | 509 | -47.41 | 33,994 | 10,929 | 32 | 33,327 |
| Scots Bay #8 | 2024-08-11 | -35.4294 | 517 | -51.40 | 13,079 | 2,750 | 21 | 7,959 |
| Scots Bay #9 | 2024-08-25 | -35.4211 | 488 | -53.04 | 8,459 | 1,976 | 23 | 6,338 |
| Scots Bay #10 | 2024-09-08 | -35.0591 | 684 | -54.05 | 8,621 | 3,146 | 36 | 7,432 |
| Scots Bay #11 | 2024-09-23 | -35.2179 | 593 | -54.84 | 6,478 | 1,280 | 20 | 5,427 |
| Summary | 558 | -51.43 | 270,324 | 46,522 | 17 | 234,216 |
Area Plot
Figure. Plots of Transects and area buffer for each survey.
Length Frequency
Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during Scots Bay surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
Target Strength
Table. Summary of 2024 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Scots Bay #1 | May - 5 | -35.5000 | |||||||||
| Scots Bay #2 | 15 | May - 20 | -35.5000 | ||||||||
| Scots Bay #3 | 13 | Jun - 2 | 19 | 4 | 70 | 3422 | 283 | 166 | -35.0685 | 161 | -35.0141 |
| Scots Bay #4 | 14 | Jun - 16 | 13 | 3 | 58 | 2420 | 278 | 166 | -35.2123 | 170 | -35.2552 |
| Scots Bay #5 | 15 | Jul - 1 | 2 | 7 | 44 | 375 | 270 | 148 | -34.9899 | 166 | -35.1679 |
| Scots Bay #6 | 14 | Jul - 15 | -35.5000 | ||||||||
| Scots Bay #7 | 14 | Jul - 29 | 8 | 3 | 76 | 1485 | 285 | 193 | -35.6507 | 182 | -35.5476 |
| Scots Bay #8 | 13 | Aug - 11 | 8 | 3 | 78 | 1449 | 280 | 177 | -35.4294 | 177 | -35.4294 |
| Scots Bay #9 | 14 | Aug - 25 | 4 | 2 | 45 | 766 | 275 | 170 | -35.4211 | 180 | -35.5135 |
| Scots Bay #10 | 14 | Sep - 8 | 2 | 1 | 24 | 378 | 265 | 145 | -35.0591 | 177 | -35.4410 |
| Scots Bay #11 | 15 | Sep - 23 | 3 | 4 | 88 | 606 | 274 | 161 | -35.2179 | 172 | -35.3137 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Scots Bay acoustic surveys.
SSB Bubble Plots
SSB - Spawning Stock Biomass
Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.
Work in Progress - Years with missing Bubbles have not been added to the database.
adjusted SSB Bubble Plots
SSB - Spawning Stock Biomass
Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-05-05 | BP_T01 | -35.5 | -56.8528 | 38.8252 | 0.0384 | 3,118.1685 |
| ScotsBayMainBox | 2024-05-05 | BP_T02 | -35.5 | -48.2212 | 37.0238 | 0.2940 | 22,754.2062 |
| ScotsBayMainBox | 2024-05-05 | LM_T01 | -35.5 | -60.6876 | 43.0173 | 0.0143 | 1,289.4965 |
| ScotsBayMainBox | 2024-05-05 | LM_T02 | -35.5 | -58.0359 | 47.6002 | 0.0239 | 2,374.6061 |
| ScotsBayMainBox | 2024-05-05 | MS_T01 | -35.5 | -46.4381 | 37.2330 | 0.4408 | 34,306.0681 |
| ScotsBayNorthBox | 2024-05-06 | MS_T02 | -35.5 | -56.1245 | 19.0482 | 0.0306 | 692.9731 |
| ScotsBayNorthBox | 2024-05-06 | MS_T03 | -35.5 | -54.7671 | 17.6194 | 0.0452 | 947.2336 |
| ScotsBayNorthBox | 2024-05-06 | MS_T04 | -35.5 | -56.2930 | 16.1081 | 0.0348 | 666.5989 |
| ScotsBayNorthBox | 2024-05-06 | MS_T05 | -35.5 | -56.4145 | 14.5125 | 0.0376 | 648.2157 |
| ScotsBayEastBox | 2024-05-06 | LM_T03 | -35.5 | -67.8629 | 16.2482 | 0.0012 | 41.1953 |
| ScotsBayEastBox | 2024-05-06 | LM_T04 | -35.5 | -59.9396 | 17.8188 | 0.0069 | 255.3775 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-05-20 | BP_T01 | -35.5 | -68.4456 | 42.1698 | 0.0040 | 279.1390 |
| ScotsBayMainBox | 2024-05-20 | BP_T02 | -35.5 | -64.6858 | 41.9267 | 0.0096 | 663.4335 |
| ScotsBayMainBox | 2024-05-20 | C1_T01 | -35.5 | -56.0418 | 37.8439 | 0.0778 | 4,855.1007 |
| ScotsBayMainBox | 2024-05-20 | LM_T01 | -35.5 | -55.2911 | 44.5693 | 0.0785 | 5,771.2801 |
| ScotsBayMainBox | 2024-05-20 | LM_T02 | -35.5 | -57.9916 | 49.9650 | 0.0376 | 3,098.9652 |
| ScotsBayMainBox | 2024-05-20 | MS_T01 | -35.5 | -62.7302 | 35.9760 | 0.0175 | 1,040.7866 |
| ScotsBayMainBox | 2024-05-20 | MS_T02 | -35.5 | -55.9350 | 39.9214 | 0.0756 | 4,976.0162 |
| ScotsBayMainBox | 2024-05-20 | MS_T03 | -35.5 | -55.0764 | 41.1907 | 0.0893 | 6,063.7466 |
| ScotsBayNorthBox | 2024-05-21 | C1_T02 | -35.5 | -56.0549 | 20.3328 | 0.0332 | 659.7530 |
| ScotsBayNorthBox | 2024-05-21 | C1_T03 | -35.5 | -61.5928 | 19.4148 | 0.0097 | 184.3306 |
| ScotsBayNorthBox | 2024-05-21 | C1_T04 | -35.5 | -63.6147 | 18.7868 | 0.0063 | 115.7183 |
| ScotsBayNorthBox | 2024-05-21 | C1_T05 | -35.5 | -55.8841 | 18.2266 | 0.0385 | 686.2192 |
| ScotsBayEastBox | 2024-05-21 | BP_T03 | -35.5 | -66.5425 | 16.8028 | 0.0030 | 73.8244 |
| ScotsBayEastBox | 2024-05-21 | BP_T04 | -35.5 | -67.9131 | 16.2262 | 0.0022 | 53.8443 |
| ScotsBayEastBox | 2024-05-21 | LM_T03 | -35.5 | -68.8733 | 15.3669 | 0.0019 | 43.1633 |
| ScotsBayEastBox | 2024-05-21 | LM_T04 | -35.5 | -62.5566 | 15.0813 | 0.0083 | 184.8361 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-06-02 | C1_T02 | -35.0685 | -72.3704 | 23.6466 | 0.0026 | 111.4571 |
| ScotsBayMainBox | 2024-06-02 | C1_T03 | -35.0685 | -60.0599 | 43.6918 | 0.0235 | 1,897.3801 |
| ScotsBayMainBox | 2024-06-02 | FM_T01 | -35.0685 | -55.6694 | 47.2195 | 0.0598 | 5,214.3413 |
| ScotsBayMainBox | 2024-06-02 | FM_T02 | -35.0685 | -59.8730 | 39.8766 | 0.0269 | 1,980.7994 |
| ScotsBayMainBox | 2024-06-02 | LM_T01 | -35.0685 | -63.2799 | 46.1084 | 0.0106 | 903.9781 |
| ScotsBayMainBox | 2024-06-02 | LM_T02 | -35.0685 | -61.3118 | 39.1630 | 0.0197 | 1,422.2096 |
| ScotsBayMainBox | 2024-06-02 | MS_T01 | -35.0685 | -64.1304 | 45.2227 | 0.0089 | 743.2046 |
| ScotsBayMainBox | 2024-06-02 | MS_T02 | -35.0685 | -61.9779 | 39.1358 | 0.0169 | 1,219.9798 |
| ScotsBayNorthBox | 2024-06-02 | C1_T01 | -35.0685 | -41.3877 | 10.5870 | 1.6988 | 23,079.1351 |
| ScotsBayNorthBox | 2024-06-02 | LJ_T01 | -35.0685 | -58.7400 | 14.4043 | 0.0230 | 424.6082 |
| ScotsBayNorthBox | 2024-06-02 | LJ_T02 | -35.0685 | -46.4228 | 15.8074 | 0.3569 | 7,239.5222 |
| ScotsBayNorthBox | 2024-06-02 | LJ_T03 | -35.0685 | -46.2542 | 17.7487 | 0.3304 | 7,526.1521 |
| ScotsBayNorthBox | 2024-06-02 | LJ_T04 | -35.0685 | -45.6422 | 18.5139 | 0.3647 | 8,665.0599 |
| ScotsBayEastBox | 2024-06-02 | BP_T01 | -35.0685 | -55.9342 | 11.7890 | 0.0408 | 1,061.8690 |
| ScotsBayEastBox | 2024-06-02 | BP_T02 | -35.0685 | -71.5665 | 13.4663 | 0.0010 | 29.0296 |
| ScotsBayEastBox | 2024-06-02 | BP_T03 | -35.0685 | -66.1973 | 15.8106 | 0.0029 | 99.9453 |
| ScotsBayEastBox | 2024-06-02 | BP_T04 | -35.0685 | -65.1881 | 17.6038 | 0.0032 | 126.0905 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-06-16 | BP_T01 | -35.2123 | -63.2272 | 44.1800 | 0.0117 | 853.1488 |
| ScotsBayMainBox | 2024-06-16 | BP_T02 | -35.2123 | -76.8971 | 38.2936 | 0.0006 | 36.6469 |
| ScotsBayMainBox | 2024-06-16 | FM_T01 | -35.2123 | -60.4385 | 42.4681 | 0.0231 | 1,621.4187 |
| ScotsBayMainBox | 2024-06-16 | FM_T02 | -35.2123 | -48.8988 | 37.3747 | 0.3748 | 23,113.6534 |
| ScotsBayMainBox | 2024-06-16 | LJ_T01 | -35.2123 | -61.6056 | 46.3708 | 0.0162 | 1,239.3134 |
| ScotsBayMainBox | 2024-06-16 | LJ_T02 | -35.2123 | -59.2314 | 40.3133 | 0.0322 | 2,140.9203 |
| ScotsBayMainBox | 2024-06-16 | LM_T01 | -35.2123 | -61.0994 | 42.5736 | 0.0198 | 1,392.5427 |
| ScotsBayMainBox | 2024-06-16 | LM_T02 | -35.2123 | -63.2020 | 35.8049 | 0.0145 | 858.1125 |
| ScotsBayNorthBox | 2024-06-16 | LB_T01 | -35.2123 | -70.6916 | 14.3743 | 0.0013 | 24.2480 |
| ScotsBayNorthBox | 2024-06-16 | LB_T02 | -35.2123 | -67.0126 | 15.7947 | 0.0028 | 56.5684 |
| ScotsBayNorthBox | 2024-06-16 | LB_T03 | -35.2123 | -66.5827 | 17.7403 | 0.0027 | 62.4537 |
| ScotsBayNorthBox | 2024-06-16 | LB_T04 | -35.2123 | -62.9611 | 18.9066 | 0.0059 | 143.7862 |
| ScotsBayEastBox | 2024-06-16 | C1_T01 | -35.2123 | -66.9592 | 13.2063 | 0.0032 | 87.8849 |
| ScotsBayEastBox | 2024-06-16 | C1_T02 | -35.2123 | -71.8044 | 14.1091 | 0.0010 | 28.7999 |
| ScotsBayEastBox | 2024-06-16 | C1_T03 | -35.2123 | -57.2279 | 15.7337 | 0.0249 | 826.1216 |
| ScotsBayEastBox | 2024-06-16 | C1_T04 | -35.2123 | -65.6343 | 19.2316 | 0.0029 | 119.2335 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-07-01 | BP_T01 | -34.9899 | -65.6464 | 44.3502 | 0.0048 | 495.3100 |
| ScotsBayMainBox | 2024-07-01 | BP_T02 | -34.9899 | -66.0570 | 35.6102 | 0.0054 | 450.6271 |
| ScotsBayMainBox | 2024-07-01 | LB_T01 | -34.9899 | -62.8420 | 42.6979 | 0.0094 | 944.7472 |
| ScotsBayMainBox | 2024-07-01 | LB_T02 | -34.9899 | -66.2764 | 36.4378 | 0.0050 | 428.4230 |
| ScotsBayMainBox | 2024-07-01 | LM_T01 | -34.9899 | -61.7651 | 46.5148 | 0.0111 | 1,210.6083 |
| ScotsBayMainBox | 2024-07-01 | LM_T02 | -34.9899 | -63.6598 | 40.2091 | 0.0083 | 782.5897 |
| ScotsBayNorthBox | 2024-07-01 | C1_T01 | -34.9899 | -65.0222 | 18.5820 | 0.0036 | 78.2188 |
| ScotsBayNorthBox | 2024-07-01 | C1_T02 | -34.9899 | -62.1844 | 17.7156 | 0.0072 | 150.3467 |
| ScotsBayNorthBox | 2024-07-01 | C1_T03 | -34.9899 | -63.8319 | 16.2318 | 0.0054 | 102.8833 |
| ScotsBayNorthBox | 2024-07-01 | C1_T04 | -34.9899 | -68.1399 | 14.5526 | 0.0022 | 38.1541 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-07-15 | C1_T01 | -35.5 | -60.9993 | 48.6479 | 0.0196 | 1,836.4192 |
| ScotsBayMainBox | 2024-07-15 | C1_T02 | -35.5 | -69.8310 | 41.9967 | 0.0030 | 240.3297 |
| ScotsBayMainBox | 2024-07-15 | LB_T01 | -35.5 | -65.8251 | 43.0387 | 0.0073 | 604.4998 |
| ScotsBayMainBox | 2024-07-15 | LB_T02 | -35.5 | -70.7995 | 36.4340 | 0.0027 | 192.2867 |
| ScotsBayMainBox | 2024-07-15 | LJ_T01 | -35.5 | -68.3996 | 46.6288 | 0.0037 | 334.1516 |
| ScotsBayMainBox | 2024-07-15 | LJ_T02 | -35.5 | -69.4927 | 39.4148 | 0.0034 | 259.7988 |
| ScotsBayMainBox | 2024-07-15 | LM_T01 | -35.5 | -64.9819 | 44.5349 | 0.0086 | 734.0290 |
| ScotsBayMainBox | 2024-07-15 | LM_T02 | -35.5 | -71.8019 | 37.8827 | 0.0021 | 152.6558 |
| ScotsBayNorthBox | 2024-07-15 | BP_T01 | -35.5 | -61.9838 | 14.3936 | 0.0099 | 178.8011 |
| ScotsBayNorthBox | 2024-07-15 | BP_T02 | -35.5 | -64.8731 | 15.7197 | 0.0047 | 91.9267 |
| ScotsBayNorthBox | 2024-07-15 | BP_T03 | -35.5 | -63.2722 | 16.0267 | 0.0066 | 132.9007 |
| ScotsBayNorthBox | 2024-07-15 | BP_T04 | -35.5 | -66.8859 | 17.2223 | 0.0027 | 57.8310 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-07-29 | BP_T01 | -35.6507 | -52.9709 | 43.4137 | 0.1428 | 9,439.1920 |
| ScotsBayMainBox | 2024-07-29 | BP_T02 | -35.6507 | -65.1345 | 38.0860 | 0.0099 | 573.5501 |
| ScotsBayMainBox | 2024-07-29 | FM_T01 | -35.6507 | -53.3034 | 41.1135 | 0.1397 | 8,743.5356 |
| ScotsBayMainBox | 2024-07-29 | FM_T02 | -35.6507 | -63.7907 | 37.3220 | 0.0138 | 781.5394 |
| ScotsBayMainBox | 2024-07-29 | LJ_T01 | -35.6507 | -53.6004 | 47.1615 | 0.1137 | 8,165.5566 |
| ScotsBayMainBox | 2024-07-29 | LJ_T02 | -35.6507 | -65.0783 | 41.7101 | 0.0092 | 581.0195 |
| ScotsBayMainBox | 2024-07-29 | MS_T01 | -35.6507 | -55.6092 | 49.3061 | 0.0685 | 5,141.6348 |
| ScotsBayMainBox | 2024-07-29 | MS_T02 | -35.6507 | -65.1732 | 36.4531 | 0.0102 | 568.4680 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-08-11 | BP_T01 | -35.4294 | -63.2055 | 40.0532 | 0.0141 | 862.5349 |
| ScotsBayMainBox | 2024-08-11 | BP_T02 | -35.4294 | -61.5732 | 36.2744 | 0.0227 | 1,256.0560 |
| ScotsBayMainBox | 2024-08-11 | C1_T01 | -35.4294 | -59.7336 | 45.9674 | 0.0274 | 1,918.5378 |
| ScotsBayMainBox | 2024-08-11 | C1_T02 | -35.4294 | -60.4494 | 39.2615 | 0.0272 | 1,626.9806 |
| ScotsBayMainBox | 2024-08-11 | LM_T01 | -35.4294 | -63.9136 | 47.3701 | 0.0101 | 732.7716 |
| ScotsBayMainBox | 2024-08-11 | LM_T02 | -35.4294 | -58.0853 | 41.9593 | 0.0438 | 2,804.1257 |
| ScotsBayMainBox | 2024-08-11 | MS_T01 | -35.4294 | -64.1421 | 46.7739 | 0.0098 | 695.2164 |
| ScotsBayMainBox | 2024-08-11 | MS_T02 | -35.4294 | -57.5349 | 41.3978 | 0.0504 | 3,182.9982 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-08-25 | C1_T01 | -35.4211 | -64.6226 | 47.5627 | 0.0087 | 586.9959 |
| ScotsBayMainBox | 2024-08-25 | C1_T02 | -35.4211 | -62.2679 | 43.2986 | 0.0165 | 1,009.5020 |
| ScotsBayMainBox | 2024-08-25 | FM_T02 | -35.4211 | -63.7017 | 38.7812 | 0.0133 | 725.6461 |
| ScotsBayMainBox | 2024-08-25 | FM_T01 | -35.4211 | -58.2455 | 41.3386 | 0.0437 | 2,548.8400 |
| ScotsBayMainBox | 2024-08-25 | LJ_T01 | -35.4211 | -63.0895 | 46.1997 | 0.0128 | 835.4926 |
| ScotsBayMainBox | 2024-08-25 | LJ_T02 | -35.4211 | -65.4753 | 41.5079 | 0.0082 | 482.3530 |
| ScotsBayMainBox | 2024-08-25 | MS_T01 | -35.4211 | -60.6494 | 47.6514 | 0.0218 | 1,465.3969 |
| ScotsBayMainBox | 2024-08-25 | MS_T02 | -35.4211 | -63.2507 | 39.6487 | 0.0144 | 805.0655 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-09-08 | FM_T01 | -35.0591 | -57.9633 | 40.8114 | 0.0315 | 3,502.8404 |
| ScotsBayMainBox | 2024-09-08 | FM_T02 | -35.0591 | -60.1309 | 35.0845 | 0.0222 | 2,126.4649 |
| ScotsBayMainBox | 2024-09-08 | LB_T01 | -35.0591 | -65.6256 | 48.1902 | 0.0046 | 600.0529 |
| ScotsBayMainBox | 2024-09-08 | LB_T02 | -35.0591 | -62.2901 | 41.4524 | 0.0114 | 1,293.4265 |
| ScotsBayMainBox | 2024-09-08 | LM_T01 | -35.0591 | -66.3072 | 45.9798 | 0.0041 | 512.8991 |
| ScotsBayMainBox | 2024-09-08 | LM_T02 | -35.0591 | -65.7314 | 39.1601 | 0.0055 | 585.6141 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| ScotsBayMainBox | 2024-09-23 | BP_T01 | -35.2179 | -62.9308 | 34.7812 | 0.0155 | 1,004.6344 |
| ScotsBayMainBox | 2024-09-23 | BP_T02 | -35.2179 | -72.8204 | 22.5291 | 0.0025 | 103.0509 |
| ScotsBayMainBox | 2024-09-23 | C1_T01 | -35.2179 | -66.0519 | 46.1041 | 0.0057 | 489.6658 |
| ScotsBayMainBox | 2024-09-23 | C1_T02 | -35.2179 | -72.0942 | 35.9372 | 0.0018 | 121.8078 |
| ScotsBayMainBox | 2024-09-23 | LJ_T01 | -35.2179 | -61.6325 | 46.8160 | 0.0155 | 1,354.6974 |
| ScotsBayMainBox | 2024-09-23 | LJ_T02 | -35.2179 | -63.9927 | 39.6770 | 0.0106 | 786.7163 |
| ScotsBayMainBox | 2024-09-23 | MS_T01 | -35.2179 | -60.9652 | 50.2596 | 0.0169 | 1,579.7118 |
| ScotsBayMainBox | 2024-09-23 | MS_T02 | -35.2179 | -62.7882 | 42.3944 | 0.0131 | 1,038.1809 |
Notes
German Bank
Summary
Table. Summary of the 2024 German Bank spawning ground acoustic survey data and associated biomass estimates. Adjusted biomass numbers refer to adjustment for turnover.
| Location | Date | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Unadjusted Biomass (t) | Standard Error (t) | St. Err % | Adjusted Biomass |
|---|---|---|---|---|---|---|---|---|
| German Bank #1 | 2024-08-04 | -35.5000 | 828 | -57.67 | 5,026 | 2,207 | 44 | 5,026 |
| German Bank #2 | 2024-08-18 | -35.5000 | 840 | -54.20 | 11,333 | 2,173 | 19 | 10,353 |
| German Bank #3 | 2024-09-02 | -35.5000 | 831 | -54.26 | 11,070 | 4,730 | 43 | 8,899 |
| German Bank #4 | 2024-09-15 | -35.0846 | 815 | -50.95 | 21,117 | 9,179 | 43 | 18,363 |
| German Bank #5 | 2024-09-29 | -35.2085 | 816 | -53.83 | 11,196 | 2,072 | 19 | 6,588 |
| German Bank #6 | 2024-10-20 | -35.5000 | 809 | -51.79 | 18,989 | 7,804 | 41 | 17,847 |
| German Bank #7 | 2024-11-03 | -35.5000 | 896 | -60.27 | 2,989 | 2,166 | 72 | 0 |
| Summary | 833 | -54.71 | 81,719 | 13,642 | 17 | 67,075 |
Area Plot
Figure. Plots of Transects and area buffer for each survey.
Length Frequency
Figure. Length distribution used for calculation of TS for the German Bank acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during German Bank surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
Target Strength
Table. Summary of 2024 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| German Bank #1 | Aug - 4 | -35.5000 | |||||||||
| German Bank #2 | 14 | Aug - 18 | -35.5000 | ||||||||
| German Bank #3 | 15 | Sep - 2 | -35.5000 | ||||||||
| German Bank #4 | 6 | Sep - 8 | 9 | 5 | 132 | 1805 | 288 | 181 | -35.2951 | 167 | -35.1756 |
| German Bank #5 | 7 | Sep - 15 | 2 | 1 | 28 | 356 | 282 | 166 | -35.0846 | 162 | -35.0509 |
| German Bank #6 | 14 | Sep - 29 | 1 | 2 | 44 | 218 | 282 | 170 | -35.2085 | 167 | -35.1741 |
| German Bank #7 | 21 | Oct - 20 | -35.5000 | ||||||||
| German Bank #8 | 14 | Nov - 3 | -35.5000 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 German Bank acoustic surveys.
SSB Bubble Plots
SSB - Spawning Stock Biomass
Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.
Work in Progress - Years with missing Bubbles have not been added to the database.
adjusted SSB Bubble Plots
SSB - Spawning Stock Biomass
Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-08-04 | C1_T01 | -35.5 | -69.7049 | 40.7256 | 0.0044 | 314.5217 |
| German | 2024-08-04 | C1_T02 | -35.5 | -81.7908 | 40.9366 | 0.0003 | 19.4562 |
| German | 2024-08-04 | FM_T01 | -35.5 | -60.8914 | 39.7546 | 0.0343 | 2,393.3390 |
| German | 2024-08-04 | FM_T02 | -35.5 | -67.3759 | 39.0071 | 0.0078 | 537.7076 |
| German | 2024-08-04 | LB_T01 | -35.5 | -68.2386 | 39.0887 | 0.0064 | 440.8375 |
| German | 2024-08-04 | LB_T02 | -35.5 | -75.8551 | 38.1323 | 0.0011 | 76.3183 |
| German | 2024-08-04 | LJ_T01 | -35.5 | -70.0337 | 37.1280 | 0.0045 | 291.5875 |
| German | 2024-08-04 | LJ_T02 | -35.5 | -78.6009 | 37.3759 | 0.0006 | 40.5557 |
| German | 2024-08-04 | LM_T01 | -35.5 | -70.5901 | 38.2892 | 0.0038 | 256.5259 |
| German | 2024-08-04 | LM_T02 | -35.5 | -68.4474 | 38.4470 | 0.0062 | 420.1430 |
| German | 2024-08-04 | MS_T01 | -35.5 | -72.2803 | 41.9894 | 0.0024 | 173.8239 |
| German | 2024-08-04 | MS_T02 | -35.5 | -76.8243 | 40.5937 | 0.0009 | 61.0540 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-08-18 | BP_T01 | -35.5 | -66.0153 | 42.3147 | 0.0097 | 745.6485 |
| German | 2024-08-18 | BP_T02 | -35.5 | -66.9381 | 36.6102 | 0.0090 | 602.9184 |
| German | 2024-08-18 | FM_T01 | -35.5 | -60.7531 | 38.4645 | 0.0357 | 2,504.6740 |
| German | 2024-08-18 | FM_T02 | -35.5 | -62.7891 | 37.0674 | 0.0232 | 1,567.3255 |
| German | 2024-08-18 | LB_T01 | -35.5 | -66.8626 | 38.5874 | 0.0087 | 613.4871 |
| German | 2024-08-18 | LB_T02 | -35.5 | -63.4462 | 38.0630 | 0.0194 | 1,347.2329 |
| German | 2024-08-18 | LJ_T01 | -35.5 | -65.7566 | 37.1204 | 0.0117 | 791.4126 |
| German | 2024-08-18 | LJ_T02 | -35.5 | -71.0362 | 37.2516 | 0.0035 | 234.6615 |
| German | 2024-08-18 | LM_T01 | -35.5 | -65.9390 | 37.8375 | 0.0110 | 758.8586 |
| German | 2024-08-18 | LM_T02 | -35.5 | -69.8473 | 37.8355 | 0.0045 | 308.5573 |
| German | 2024-08-18 | MS_T01 | -35.5 | -65.9407 | 40.0932 | 0.0104 | 758.5724 |
| German | 2024-08-18 | MS_T02 | -35.5 | -64.3277 | 38.9684 | 0.0155 | 1,099.7423 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-09-02 | BP_T01 | -35.5 | -66.0165 | 36.4761 | 0.0092 | 738.0706 |
| German | 2024-09-02 | BP_T02 | -35.5 | -74.8712 | 36.7469 | 0.0012 | 96.0770 |
| German | 2024-09-02 | LB_T01 | -35.5 | -65.8349 | 38.5499 | 0.0091 | 769.5874 |
| German | 2024-09-02 | LB_T02 | -35.5 | -71.3991 | 38.1007 | 0.0026 | 213.7137 |
| German | 2024-09-02 | LJ_T01 | -35.5 | -60.7467 | 36.8251 | 0.0307 | 2,483.5646 |
| German | 2024-09-02 | LJ_T02 | -35.5 | -74.5397 | 36.9995 | 0.0013 | 103.6989 |
| German | 2024-09-02 | LM_T01 | -35.5 | -69.1152 | 38.2841 | 0.0043 | 361.5949 |
| German | 2024-09-02 | LM_T02 | -35.5 | -75.3052 | 37.6952 | 0.0011 | 86.9415 |
| German | 2024-09-02 | MS_T01 | -35.5 | -57.6722 | 40.0739 | 0.0573 | 5,041.0272 |
| German | 2024-09-02 | MS_T02 | -35.5 | -63.9960 | 39.1032 | 0.0137 | 1,175.2911 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-09-15 | C1_T01 | -35.0846 | -67.1692 | 39.6770 | 0.0072 | 504.0888 |
| German | 2024-09-15 | C1_T02 | -35.0846 | -69.3752 | 38.9441 | 0.0044 | 303.3184 |
| German | 2024-09-15 | FM_T01 | -35.0846 | -60.3711 | 38.1101 | 0.0356 | 2,411.6238 |
| German | 2024-09-15 | FM_T02 | -35.0846 | -62.7153 | 37.5717 | 0.0211 | 1,405.6910 |
| German | 2024-09-15 | LB_T01 | -35.0846 | -61.3720 | 38.1057 | 0.0283 | 1,915.2238 |
| German | 2024-09-15 | LB_T02 | -35.0846 | -69.1200 | 38.2088 | 0.0047 | 321.6825 |
| German | 2024-09-15 | LJ_T01 | -35.0846 | -64.9421 | 37.3923 | 0.0127 | 841.8082 |
| German | 2024-09-15 | LJ_T02 | -35.0846 | -70.9114 | 37.3236 | 0.0032 | 212.9509 |
| German | 2024-09-15 | LM_T01 | -35.0846 | -54.2713 | 38.3974 | 0.1441 | 9,824.0117 |
| German | 2024-09-15 | LM_T02 | -35.0846 | -73.9026 | 37.6894 | 0.0016 | 106.9449 |
| German | 2024-09-15 | MS_T01 | -35.0846 | -60.8272 | 38.7233 | 0.0316 | 2,171.1988 |
| German | 2024-09-15 | MS_T02 | -35.0846 | -63.7866 | 38.5662 | 0.0160 | 1,098.4157 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-09-29 | BP_T01 | -35.2085 | -65.3257 | 36.3169 | 0.0122 | 793.9106 |
| German | 2024-09-29 | BP_T02 | -35.2085 | -68.0974 | 36.6063 | 0.0064 | 419.3684 |
| German | 2024-09-29 | FM_T01 | -35.2085 | -62.0723 | 37.6688 | 0.0248 | 1,679.2408 |
| German | 2024-09-29 | FM_T02 | -35.2085 | -65.9247 | 37.9591 | 0.0101 | 691.6237 |
| German | 2024-09-29 | LB_T01 | -35.2085 | -64.5384 | 38.2101 | 0.0139 | 951.7068 |
| German | 2024-09-29 | LB_T02 | -35.2085 | -65.1874 | 37.9657 | 0.0120 | 819.5909 |
| German | 2024-09-29 | LJ_T01 | -35.2085 | -65.0602 | 37.2935 | 0.0126 | 843.9476 |
| German | 2024-09-29 | LJ_T02 | -35.2085 | -65.7728 | 37.0466 | 0.0108 | 716.2499 |
| German | 2024-09-29 | LM_T01 | -35.2085 | -73.5138 | 37.8511 | 0.0018 | 120.4919 |
| German | 2024-09-29 | LM_T02 | -35.2085 | -60.4968 | 37.6446 | 0.0357 | 2,413.5602 |
| German | 2024-09-29 | MS_T01 | -35.2085 | -63.9318 | 40.5187 | 0.0150 | 1,094.3700 |
| German | 2024-09-29 | MS_T02 | -35.2085 | -66.1800 | 38.9286 | 0.0093 | 652.1320 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-10-20 | BP_T01 | -35.5 | -77.1700 | 36.3973 | 0.0008 | 55.0476 |
| German | 2024-10-20 | BP_T02 | -35.5 | -72.5949 | 36.5344 | 0.0024 | 157.8516 |
| German | 2024-10-20 | FM_T01 | -35.5 | -58.1810 | 38.2370 | 0.0638 | 4,361.5678 |
| German | 2024-10-20 | FM_T02 | -35.5 | -65.9694 | 37.6924 | 0.0108 | 725.7711 |
| German | 2024-10-20 | LB_T01 | -35.5 | -60.2534 | 37.9983 | 0.0398 | 2,706.4510 |
| German | 2024-10-20 | LB_T02 | -35.5 | -71.0522 | 37.9998 | 0.0033 | 225.1742 |
| German | 2024-10-20 | LJ_T01 | -35.5 | -68.8586 | 37.0189 | 0.0056 | 373.1443 |
| German | 2024-10-20 | LJ_T02 | -35.5 | -72.7177 | 36.9683 | 0.0023 | 153.4493 |
| German | 2024-10-20 | LM_T01 | -35.5 | -55.7963 | 38.5090 | 0.1097 | 7,552.8097 |
| German | 2024-10-20 | LM_T02 | -35.5 | -68.9007 | 37.6787 | 0.0055 | 369.5426 |
| German | 2024-10-20 | MS_T01 | -35.5 | -61.7010 | 38.2417 | 0.0284 | 1,939.2759 |
| German | 2024-10-20 | MS_T02 | -35.5 | -68.9120 | 38.9797 | 0.0053 | 368.5848 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| German | 2024-11-03 | BP_T01 | -35.5 | -70.5663 | 37.2287 | 0.0019 | 279.1015 |
| German | 2024-11-03 | BP_T02 | -35.5 | -70.5832 | 37.6450 | 0.0019 | 278.0178 |
| German | 2024-11-03 | LM_T01 | -35.5 | -71.8821 | 37.6329 | 0.0014 | 206.1500 |
| German | 2024-11-03 | LM_T02 | -35.5 | -61.5498 | 36.7553 | 0.0154 | 2,225.4021 |
| German | 2024-11-03 | MS_T01 | -35.5 | -Inf | 38.5253 | 0.0000 | 0.0000 |
| German | 2024-11-03 | MS_T02 | -35.5 | -Inf | 39.8497 | 0.0000 | 0.0000 |
Notes
Seal Island
Summary
Table. Summary of the 2024 Seal Island spawning ground acoustic survey data and associated biomass estimates.
| Location | Date | Interval (Days) | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Biomass (t) | Standard Error (t) | St. Err % |
|---|---|---|---|---|---|---|---|---|
| Seal Island #1 | 2024-08-05 | -35.5000 | 259 | -44.68 | 31,328 | 14,873 | 47 | |
| Seal Island #2 | 2024-08-19 | 14 | -35.5000 | 257 | -52.40 | 5,241 | 1,770 | 34 |
| Seal Island #3 | 2024-09-03 | 15 | -35.5000 | 258 | -54.97 | 2,914 | 565 | 19 |
| Seal Island #4 | 2024-09-16 | 13 | -35.0313 | 258 | -57.28 | 1,538 | 225 | 15 |
| Seal Island #5 | 2024-09-30 | 14 | -35.5000 | 261 | -52.57 | 5,125 | 753 | 15 |
| Seal Island #6 | 2024-10-21 | 21 | -35.5000 | 259 | -54.13 | 3,543 | 1,154 | 33 |
| Seal Island #7 | 2024-11-04 | 14 | -35.5000 | 245 | -64.28 | 324 | 103 | 32 |
| Summary | 257 | -54.33 | 50,013 | 15,054 | 30 |
Length Frequency
Figure. Length distribution used for calculation of TS for the Seal Island acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during Seal Island surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
Target Strength
Table. Summary of 2024 fish sampled for Seal Island by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Seal Island #1 | Aug - 4 | -35.5000 | |||||||||
| Seal Island #2 | 14 | Aug - 18 | -35.5000 | ||||||||
| Seal Island #3 | 15 | Sep - 2 | -35.5000 | ||||||||
| Seal Island #4 | 13 | Sep - 15 | 2 | 1 | 26 | 370 | 280 | 161 | -35.0313 | 161 | -35.0313 |
| Seal Island #5 | 14 | Sep - 29 | -35.5000 | ||||||||
| Seal Island #6 | 21 | Oct - 20 | -35.5000 | ||||||||
| Seal Island #7 | 14 | Nov - 3 | -35.5000 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Seal Island acoustic surveys.
SSB Bubble Plots
SSB - Spawning Stock Biomass
Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Seal Island acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.
Work in Progress - Years with missing Bubbles have not been added to the database.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-08-05 | C1_T03 | -35.5 | -71.2869 | 32.1554 | 0.0030 | 68.4331 |
| SealIsland | 2024-08-05 | C1_T04 | -35.5 | -58.2436 | 31.1798 | 0.0616 | 1,379.0909 |
| SealIsland | 2024-08-05 | FM_T03 | -35.5 | -69.2523 | 29.8775 | 0.0051 | 109.3260 |
| SealIsland | 2024-08-05 | FM_T04 | -35.5 | -55.6193 | 30.2265 | 0.1162 | 2,523.6056 |
| SealIsland | 2024-08-05 | LB_T03 | -35.5 | -48.8130 | 29.2836 | 0.5751 | 12,096.3344 |
| SealIsland | 2024-08-05 | LB_T04 | -35.5 | -68.1401 | 29.7913 | 0.0066 | 141.2347 |
| SealIsland | 2024-08-05 | LJ_T03 | -35.5 | -50.0117 | 28.3467 | 0.4508 | 9,178.7012 |
| SealIsland | 2024-08-05 | LJ_T04 | -35.5 | -72.1693 | 29.2355 | 0.0027 | 55.8508 |
| SealIsland | 2024-08-05 | LM_T03 | -35.5 | -74.1714 | 28.8029 | 0.0017 | 35.2218 |
| SealIsland | 2024-08-05 | LM_T04 | -35.5 | -52.2448 | 28.9953 | 0.2635 | 5,488.7382 |
| SealIsland | 2024-08-05 | MS_T03 | -35.5 | -68.3014 | 30.5395 | 0.0062 | 136.0879 |
| SealIsland | 2024-08-05 | MS_T04 | -35.5 | -69.0163 | 32.6730 | 0.0049 | 115.4314 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-08-19 | BP_T03 | -35.5 | -78.8695 | 28.6450 | 0.0006 | 11.8214 |
| SealIsland | 2024-08-19 | BP_T04 | -35.5 | -68.3381 | 28.9404 | 0.0063 | 133.6014 |
| SealIsland | 2024-08-19 | FM_T03 | -35.5 | -66.4524 | 29.5391 | 0.0096 | 206.2413 |
| SealIsland | 2024-08-19 | FM_T04 | -35.5 | -58.3074 | 29.2291 | 0.0632 | 1,345.4997 |
| SealIsland | 2024-08-19 | LB_T03 | -35.5 | -68.1976 | 29.1995 | 0.0065 | 137.9929 |
| SealIsland | 2024-08-19 | LB_T04 | -35.5 | -61.9407 | 29.5741 | 0.0271 | 582.8374 |
| SealIsland | 2024-08-19 | LJ_T03 | -35.5 | -73.6952 | 28.2633 | 0.0019 | 38.9134 |
| SealIsland | 2024-08-19 | LJ_T04 | -35.5 | -66.5883 | 28.8891 | 0.0095 | 199.8901 |
| SealIsland | 2024-08-19 | LM_T03 | -35.5 | -69.2401 | 29.8382 | 0.0050 | 108.5446 |
| SealIsland | 2024-08-19 | LM_T04 | -35.5 | -58.8899 | 29.1525 | 0.0554 | 1,176.6136 |
| SealIsland | 2024-08-19 | MS_T03 | -35.5 | -73.0616 | 30.3797 | 0.0020 | 45.0257 |
| SealIsland | 2024-08-19 | MS_T04 | -35.5 | -58.6133 | 31.0853 | 0.0554 | 1,253.9742 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-09-03 | BP_T03 | -35.5 | -64.4544 | 28.6774 | 0.0130 | 328.1828 |
| SealIsland | 2024-09-03 | BP_T04 | -35.5 | -64.2996 | 27.5496 | 0.0140 | 340.0928 |
| SealIsland | 2024-09-03 | LB_T03 | -35.5 | -64.9805 | 29.5027 | 0.0112 | 290.7420 |
| SealIsland | 2024-09-03 | LB_T04 | -35.5 | -70.4800 | 29.6062 | 0.0031 | 81.9508 |
| SealIsland | 2024-09-03 | LJ_T03 | -35.5 | -69.8247 | 28.5920 | 0.0038 | 95.2967 |
| SealIsland | 2024-09-03 | LJ_T04 | -35.5 | -62.7065 | 28.7967 | 0.0193 | 490.7971 |
| SealIsland | 2024-09-03 | LM_T03 | -35.5 | -62.2220 | 29.1657 | 0.0213 | 548.7255 |
| SealIsland | 2024-09-03 | LM_T04 | -35.5 | -69.1186 | 29.4873 | 0.0043 | 112.1224 |
| SealIsland | 2024-09-03 | MS_T03 | -35.5 | -68.4391 | 30.0631 | 0.0049 | 131.1133 |
| SealIsland | 2024-09-03 | MS_T04 | -35.5 | -62.6710 | 31.2884 | 0.0179 | 494.8320 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-09-16 | C1_T03 | -35.0313 | -78.2769 | 29.8145 | 0.0006 | 12.2200 |
| SealIsland | 2024-09-16 | C1_T04 | -35.0313 | -66.4616 | 29.8448 | 0.0084 | 185.6072 |
| SealIsland | 2024-09-16 | FM_T03 | -35.0313 | -69.9541 | 28.7023 | 0.0039 | 83.0503 |
| SealIsland | 2024-09-16 | FM_T04 | -35.0313 | -66.5057 | 28.8091 | 0.0086 | 183.7316 |
| SealIsland | 2024-09-16 | LB_T03 | -35.0313 | -71.8813 | 28.9729 | 0.0025 | 53.2869 |
| SealIsland | 2024-09-16 | LB_T04 | -35.0313 | -67.7514 | 28.8273 | 0.0065 | 137.9146 |
| SealIsland | 2024-09-16 | LJ_T03 | -35.0313 | -66.2685 | 28.5049 | 0.0092 | 194.0462 |
| SealIsland | 2024-09-16 | LJ_T04 | -35.0313 | -70.2762 | 28.3639 | 0.0037 | 77.1135 |
| SealIsland | 2024-09-16 | LM_T03 | -35.0313 | -68.0921 | 29.0189 | 0.0059 | 127.5090 |
| SealIsland | 2024-09-16 | LM_T04 | -35.0313 | -68.0341 | 28.5721 | 0.0061 | 129.2235 |
| SealIsland | 2024-09-16 | MS_T03 | -35.0313 | -68.5882 | 29.1372 | 0.0053 | 113.7453 |
| SealIsland | 2024-09-16 | MS_T04 | -35.0313 | -65.3355 | 29.5027 | 0.0110 | 240.5492 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-09-30 | BP_T03 | -35.5 | -65.0425 | 29.7310 | 0.0131 | 289.9107 |
| SealIsland | 2024-09-30 | BP_T04 | -35.5 | -62.8384 | 28.8095 | 0.0224 | 481.5851 |
| SealIsland | 2024-09-30 | FM_T03 | -35.5 | -66.6466 | 29.2748 | 0.0092 | 200.3789 |
| SealIsland | 2024-09-30 | FM_T04 | -35.5 | -60.9530 | 28.6920 | 0.0347 | 743.3785 |
| SealIsland | 2024-09-30 | LB_T03 | -35.5 | -63.3213 | 28.9420 | 0.0199 | 430.9078 |
| SealIsland | 2024-09-30 | LB_T04 | -35.5 | -62.3302 | 29.0440 | 0.0250 | 541.3670 |
| SealIsland | 2024-09-30 | LJ_T03 | -35.5 | -63.7054 | 28.2726 | 0.0187 | 394.4318 |
| SealIsland | 2024-09-30 | LJ_T04 | -35.5 | -65.5367 | 28.4400 | 0.0122 | 258.7263 |
| SealIsland | 2024-09-30 | LM_T03 | -35.5 | -66.1982 | 28.8493 | 0.0103 | 222.1745 |
| SealIsland | 2024-09-30 | LM_T04 | -35.5 | -62.6657 | 29.2573 | 0.0229 | 501.1223 |
| SealIsland | 2024-09-30 | MS_T03 | -35.5 | -67.1809 | 30.0650 | 0.0079 | 177.1830 |
| SealIsland | 2024-09-30 | MS_T04 | -35.5 | -60.2022 | 30.0468 | 0.0394 | 883.6701 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-10-21 | BP_T04 | -35.5 | -67.7096 | 26.7267 | 0.0077 | 155.4973 |
| SealIsland | 2024-10-21 | Region 4 | -35.5 | -70.2831 | 24.4737 | 0.0047 | 85.9750 |
| SealIsland | 2024-10-21 | FM_T03 | -35.5 | -58.8397 | 29.4892 | 0.0541 | 1,198.6972 |
| SealIsland | 2024-10-21 | FM_T04 | -35.5 | -60.8472 | 29.1570 | 0.0345 | 755.0258 |
| SealIsland | 2024-10-21 | LB_T03 | -35.5 | -70.9919 | 30.2242 | 0.0032 | 73.0290 |
| SealIsland | 2024-10-21 | LB_T04 | -35.5 | -65.1735 | 29.0305 | 0.0128 | 278.8265 |
| SealIsland | 2024-10-21 | LJ_T03 | -35.5 | -67.1786 | 27.7498 | 0.0084 | 175.7221 |
| SealIsland | 2024-10-21 | LJ_T04 | -35.5 | -69.6478 | 28.3341 | 0.0047 | 99.5184 |
| SealIsland | 2024-10-21 | LM_T03 | -35.5 | -64.4838 | 28.8138 | 0.0151 | 326.8131 |
| SealIsland | 2024-10-21 | LM_T04 | -35.5 | -73.7799 | 28.6567 | 0.0018 | 38.4316 |
| SealIsland | 2024-10-21 | MS_T03 | -35.5 | -66.0614 | 30.9408 | 0.0098 | 227.2676 |
| SealIsland | 2024-10-21 | MS_T04 | -35.5 | -68.5543 | 30.7735 | 0.0055 | 128.0119 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SealIsland | 2024-11-04 | LM_T03 | -35.5 | -69.6084 | 28.1130 | 0.0016 | 95.0651 |
| SealIsland | 2024-11-04 | LM_T04 | -35.5 | -71.7229 | 28.8428 | 0.0010 | 58.4215 |
| SealIsland | 2024-11-04 | MS_T03 | -35.5 | -67.6915 | 30.6489 | 0.0023 | 147.8149 |
| SealIsland | 2024-11-04 | MS_T04 | -35.5 | -75.7465 | 30.4264 | 0.0004 | 23.1322 |
Notes
Trinity Ledge
Summary
Table. Summary of the 2024 Trinity Ledge spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.
| Location | Date | Interval (days) | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Biomass (t) | Standard Error (t) | St. Err % | NA | NA |
|---|---|---|---|---|---|---|---|---|---|---|
| Trinity Ledge #1 | 2024-08-17 | -35.7572 | 22.4899999941037 | -52.2052145556483 | 510 | 159 | 31 | 22 | -52.21 | |
| Trinity Ledge #2 | 2024-08-27 | 10 | -35.5497 | 21.6500469845207 | -39.9460013248698 | 7,867 | 3,546 | 45 | 22 | -39.95 |
| Trinity Ledge #3 | 2024-09-09 | 13 | -35.1126 | 26.0030758476602 | -40.0395196523501 | 8,362 | 3,830 | 46 | 26 | -40.04 |
| Trinity Ledge #4 | 2024-09-20 | 11 | -35.6084 | 19.3269988269823 | -46.3023112370387 | 1,647 | 781 | 47 | 19 | -46.30 |
| Summary | 22 | -44.62 | 18,387 | 5,280 | 29 |
Length Frequency
Figure. Length distribution used for calculation of TS for the Trinity Ledge acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during Trinity Ledge surveys in 2024 to determine proportion of individuals spawning for Trinity Ledge acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
### Target Strength {.tabset} Table. Summary of 2024 fish sampled for Trinity Ledge by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Trinity Ledge #1 | Aug - 17 | 8 | 2 | 48 | 1429 | 278 | 169 | -35.3077 | 173 | -35.3479 | |
| Trinity Ledge #2 | 9 | Aug - 26 | 23 | 6 | 144 | 3995 | 268 | 150 | -35.1003 | 172 | -35.3139 |
| Trinity Ledge #3 | 14 | Sep - 9 | 32 | 10 | 240 | 6044 | 255 | 123 | -34.6631 | 166 | -35.1464 |
| Trinity Ledge #4 | 10 | Sep - 19 | 16 | 5 | 113 | 2894 | 280 | 166 | -35.1589 | 166 | -35.1589 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024Trinity Ledge acoustic surveys.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| TrinityLedgeTR1 | 2024-08-17 | DD_T01 | -35.7572 | -62.7070 | 5.3066 | 0.0165 | 45.3948 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T02 | -35.7572 | -59.2610 | 6.0436 | 0.0320 | 100.3701 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T03 | -35.7572 | -62.1132 | 4.8998 | 0.0205 | 52.0460 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T04 | -35.7572 | -65.3307 | 4.9959 | 0.0096 | 24.8106 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T05 | -35.7572 | -61.9176 | 1.5803 | 0.0664 | 54.4435 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T06 | -35.7572 | -70.7492 | 1.6075 | 0.0085 | 7.1250 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T07 | -35.7572 | -71.5578 | 4.6755 | 0.0024 | 5.9146 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T08 | -35.7572 | -63.7412 | 4.4809 | 0.0154 | 35.7754 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T09 | -35.7572 | -60.5487 | 6.2841 | 0.0229 | 74.6165 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T10 | -35.7572 | -61.5314 | 1.6933 | 0.0677 | 59.5064 |
| TrinityLedgeTR1 | 2024-08-17 | DD_T11 | -35.7572 | -62.3273 | 1.7832 | 0.0536 | 49.5426 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| TrinityLedgeTR1 | 2024-08-27 | DD_T01 | -35.5497 | -50.0345 | 5.3690 | 0.3271 | 770.8806 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T02 | -35.5497 | -50.5710 | 5.3189 | 0.2918 | 681.2895 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T03 | -35.5497 | -45.8822 | 4.5397 | 1.0063 | 2,005.4634 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T04 | -35.5497 | -44.4942 | 5.7135 | 1.1007 | 2,760.6906 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T05 | -35.5497 | -66.9668 | 6.0304 | 0.0059 | 15.6226 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T06 | -35.5497 | -66.1682 | 7.4386 | 0.0057 | 18.7763 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T07 | -35.5497 | -69.0851 | 9.4253 | 0.0023 | 9.5923 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T08 | -35.5497 | -66.4073 | 1.5102 | 0.0268 | 17.7707 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T09 | -35.5497 | -49.4872 | 1.4055 | 1.4172 | 874.4153 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T10 | -35.5497 | -50.4162 | 1.6333 | 0.9847 | 706.0202 |
| TrinityLedgeTR1 | 2024-08-27 | DD_T11 | -35.5497 | -70.5114 | 0.9326 | 0.0169 | 6.9070 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| TrinityLedgeTR1 | 2024-09-09 | DD_T01 | -35.1126 | -55.9930 | 8.8049 | 0.0611 | 212.3149 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T02 | -35.1126 | -63.9380 | 6.9194 | 0.0125 | 34.0791 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T03 | -35.1126 | -64.8466 | 5.8503 | 0.0120 | 27.6455 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T15 | -35.1126 | -65.7343 | 2.8370 | 0.0201 | 22.5346 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T14 | -35.1126 | -62.9048 | 2.7825 | 0.0394 | 43.2316 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T04 | -35.1126 | -63.2628 | 5.7784 | 0.0175 | 39.8111 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T05 | -35.1126 | -48.3357 | 6.4150 | 0.4889 | 1,237.9810 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T06 | -35.1126 | -41.7651 | 6.3433 | 2.2446 | 5,620.4419 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T07 | -35.1126 | -60.7472 | 6.5891 | 0.0273 | 71.0507 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T08 | -35.1126 | -77.1026 | 1.8566 | 0.0022 | 1.6445 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T13 | -35.1126 | -55.3181 | 2.3900 | 0.2629 | 248.0145 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T12 | -35.1126 | -55.6368 | 2.2742 | 0.2567 | 230.4630 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T11 | -35.1126 | -54.7572 | 2.0147 | 0.3548 | 282.2073 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T10 | -35.1126 | -54.7047 | 1.4879 | 0.4863 | 285.6371 |
| TrinityLedgeTR1 | 2024-09-09 | DD_T09 | -35.1126 | -71.9612 | 3.5296 | 0.0039 | 5.3724 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| TrinityLedgeTR1 | 2024-09-20 | DD_T07 | -35.6084 | -73.8846 | 5.3449 | 0.0012 | 2.8744 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T06 | -35.6084 | -80.9267 | 2.4579 | 0.0005 | 0.5680 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T05 | -35.6084 | -82.2870 | 3.0281 | 0.0003 | 0.4152 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T04 | -35.6084 | -69.2233 | 6.3282 | 0.0029 | 8.4076 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T03 | -35.6084 | -48.3131 | 6.4412 | 0.3495 | 1,036.7829 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T02 | -35.6084 | -58.8271 | 6.4289 | 0.0311 | 92.1057 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T01 | -35.6084 | -51.4667 | 6.3754 | 0.1708 | 501.5712 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T08 | -35.6084 | -76.4691 | 2.8819 | 0.0012 | 1.5852 |
| TrinityLedgeTR1 | 2024-09-20 | DD_T09 | -35.6084 | -73.7364 | 2.6748 | 0.0024 | 2.9742 |
Spectacle Buoy
Summary
Table. Summary of the 2024 Spectacle Buoy spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.
| Location | Date | Interval (days) | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Biomass (t) | Standard Error (t) | St. Err % |
|---|---|---|---|---|---|---|---|---|
| Spectacle Buoy #1 | 2024-08-17 | -35.9495 | 39 | -47.15 | 2,986 | 1,381 | 46 | |
| Spectacle Buoy #2 | 2024-08-27 | 10 | -35.9209 | 42 | -44.85 | 5,340 | 3,143 | 59 |
| Spectacle Buoy #3 | 2024-09-06 | 10 | -35.8429 | 37 | -41.71 | 9,547 | 5,523 | 58 |
| Spectacle Buoy #4 | 2024-09-16 | 10 | -35.8805 | 28 | -49.22 | 1,287 | 1,125 | 87 |
| Summary | 36 | -45.73 | 19,160 | 6,599 | 34 |
Length Frequency
Figure. Length distribution used for calculation of TS for the Spectacle Buoy acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during Spectacle Buoy surveys in 2024 to determine proportion of individuals spawning for Little Hope acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
### Target Strength {.tabset} Table. Summary of 2024 fish sampled for Spectacle Buoy by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Spectacle Buoy #1 | Aug - 17 | -35.5000 | |||||||||
| Spectacle Buoy #2 | 10 | Aug - 27 | 2 | 2 | 51 | 104 | 290 | 191 | -35.4714 | 171 | -35.2967 |
| Spectacle Buoy #3 | 10 | Sep - 6 | 4 | 2 | 37 | 535 | 282 | 178 | -35.3935 | 175 | -35.3824 |
| Spectacle Buoy #4 | 10 | Sep - 16 | 3 | 1 | 17 | 450 | 302 | 206 | -35.4310 | 168 | -35.1982 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024Spectacle Buoy acoustic surveys.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SpecBuoySP1 | 2024-08-17 | DD_T01 | -35.9495 | -60.8597 | 13.7825 | 0.0180 | 127.1213 |
| SpecBuoySP1 | 2024-08-17 | DD_T02 | -35.9495 | -53.9733 | 12.3592 | 0.0980 | 620.6702 |
| SpecBuoySP1 | 2024-08-17 | DD_T03 | -35.9495 | -50.1657 | 12.2649 | 0.2373 | 1,491.4981 |
| SpecBuoySP1 | 2024-08-17 | DD_T04 | -35.9495 | -54.7036 | 13.1911 | 0.0776 | 524.6041 |
| SpecBuoySP1 | 2024-08-17 | DD_T05 | -35.9495 | -59.9556 | 12.8154 | 0.0238 | 156.5427 |
| SpecBuoySP1 | 2024-08-17 | DD_T06 | -35.9495 | -63.7663 | 12.4256 | 0.0102 | 65.0969 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SpecBuoySP1 | 2024-08-27 | DD_T01 | -35.9209 | -69.8285 | 12.3589 | 0.0029 | 16.9529 |
| SpecBuoySP1 | 2024-08-27 | DD_T02 | -35.9209 | -59.4341 | 13.0162 | 0.0300 | 185.6443 |
| SpecBuoySP1 | 2024-08-27 | DD_T03 | -35.9209 | -54.2756 | 13.1979 | 0.0972 | 608.8871 |
| SpecBuoySP1 | 2024-08-27 | DD_T04 | -35.9209 | -46.3993 | 12.3618 | 0.6362 | 3,733.9033 |
| SpecBuoySP1 | 2024-08-27 | DD_T05 | -35.9209 | -55.8548 | 11.9729 | 0.0745 | 423.2713 |
| SpecBuoySP1 | 2024-08-27 | DD_T06 | -35.9209 | -59.5729 | 10.1109 | 0.0375 | 179.8056 |
| SpecBuoySP1 | 2024-08-27 | DD_T07 | -35.9209 | -59.3783 | 10.6227 | 0.0373 | 188.0452 |
| SpecBuoySP1 | 2024-08-27 | DD_T08 | -35.9209 | -76.6415 | 4.1655 | 0.0018 | 3.5314 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SpecBuoySP1 | 2024-09-06 | DD_T09 | -35.8429 | -67.4709 | 3.5750 | 0.0155 | 25.3490 |
| SpecBuoySP1 | 2024-09-06 | DD_T08 | -35.8429 | -53.9792 | 8.3158 | 0.1485 | 566.4068 |
| SpecBuoySP1 | 2024-09-06 | DD_T07 | -35.8429 | -44.9204 | 8.4852 | 1.1721 | 4,560.4546 |
| SpecBuoySP1 | 2024-09-06 | DD_T06 | -35.8429 | -45.4144 | 9.8755 | 0.8988 | 4,070.1493 |
| SpecBuoySP1 | 2024-09-06 | DD_T05 | -35.8429 | -61.0952 | 10.0717 | 0.0238 | 110.0349 |
| SpecBuoySP1 | 2024-09-06 | DD_T04 | -35.8429 | -62.3181 | 9.9968 | 0.0181 | 83.0296 |
| SpecBuoySP1 | 2024-09-06 | DD_T03 | -35.8429 | -60.4309 | 9.8855 | 0.0283 | 128.2200 |
| SpecBuoySP1 | 2024-09-06 | DD_T02 | -35.8429 | -76.0936 | 10.5397 | 0.0007 | 3.4809 |
| SpecBuoySP1 | 2024-09-06 | DD_T01 | -35.8429 | -92.4154 | 9.6791 | 0.0000 | 0.0812 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| SpecBuoySP1 | 2024-09-16 | DD_T01 | -35.8805 | -74.1047 | 10.6378 | 0.0010 | 4.1823 |
| SpecBuoySP1 | 2024-09-16 | DD_T02 | -35.8805 | -49.3593 | 10.1466 | 0.3255 | 1,247.2553 |
| SpecBuoySP1 | 2024-09-16 | DD_T03 | -35.8805 | -84.3461 | 10.1546 | 0.0001 | 0.3956 |
| SpecBuoySP1 | 2024-09-16 | DD_T04 | -35.8805 | -69.6782 | 10.1729 | 0.0030 | 11.5895 |
| SpecBuoySP1 | 2024-09-16 | DD_T05 | -35.8805 | -71.8319 | 10.0833 | 0.0019 | 7.0582 |
| SpecBuoySP1 | 2024-09-16 | DD_T06 | -35.8805 | -73.3720 | 9.1288 | 0.0014 | 4.9508 |
| SpecBuoySP1 | 2024-09-16 | DD_T07 | -35.8805 | -70.3709 | 7.3637 | 0.0036 | 9.8807 |
| SpecBuoySP1 | 2024-09-16 | DD_T08 | -35.8805 | -77.8067 | 5.8865 | 0.0008 | 1.7832 |
Little Hope
Summary
Table. Summary of the 2024 Little Hope spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.
| Location | Date | Interval (days) | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Biomass (t) | Standard Error (t) | St. Err % |
|---|---|---|---|---|---|---|---|---|
| Little Hope #1 | 2024-08-16 | -35.9495 | 3 | -46.51 | 5,759 | 50 | 18 | |
| Little Hope #2 | 2024-08-27 | 11 | -35.9209 | 2 | -42.26 | 5,778 | 224 | 40 |
| Little Hope #3 | 2024-09-06 | 10 | -35.8429 | 2 | -36.43 | 20,852 | 460 | 30 |
| Little Hope #4 | 2024-09-16 | 10 | -35.8600 | 18 | -45.34 | 7,587 | 568 | 28 |
| Little Hope #5 | 2024-09-26 | 10 | -36.0139 | 4 | -40.45 | 6,446 | 362 | 24 |
| Little Hope #6 | 2024-10-10 | 14 | -35.6942 | 5 | -47.93 | 2,633 | 71 | 23 |
| Little Hope #7 | 2024-10-24 | 14 | -36.0444 | 5 | -36.77 | 9,960 | 3,067 | 66 |
| Summary | 6 | -42.24 | 59,013 | 5,268 | 9 |
Length Frequency
Figure. Length distribution used for calculation of TS for the Little Hope acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during Little Hope surveys in 2024 to determine proportion of individuals spawning for Little Hope acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
Target Strength
Table. Summary of 2024 fish sampled for Little Hope by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Little Hope #1 | Aug - 16 | -35.5000 | -35.5000 | ||||||||
| Little Hope #2 | 11 | Aug - 27 | 2 | 2 | 51 | 104 | 290 | 191 | -35.4714 | 171 | -35.2967 |
| Little Hope #3 | 9 | Sep - 5 | 4 | 2 | 37 | 535 | 282 | 178 | -35.3935 | 175 | -35.3824 |
| Little Hope #4 | 10 | Sep - 15 | 2 | 1 | 17 | 300 | 300 | 202 | -35.4106 | 168 | -35.1982 |
| Little Hope #5 | 10 | Sep - 25 | 6 | 2 | 31 | 766 | 300 | 209 | -35.5644 | 170 | -35.2590 |
| Little Hope #6 | 14 | Oct - 9 | 3 | 2 | 40 | 431 | 297 | 191 | -35.2447 | 169 | -35.2346 |
| Little Hope #7 | 11 | Oct - 20 | 2 | 2 | 51 | 289 | 315 | 232 | -35.5950 | 168 | -35.1975 |
| Little Hope #8 | 4 | Oct - 24 | 2 | 2 | 51 | 289 | 315 | 232 | -35.5950 | 168 | -35.1975 |
| Little Hope #9 | 9 | Nov - 2 | 2 | 2 | 36 | 133 | 290 | 185 | -35.3341 | 171 | -35.2751 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Little Hope acoustic surveys.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-08-16 | E8_T01 | -35.9495 | -60.2519 | 0.4174 | 0.1065 | 11.6413 |
| LittleHopeLH1 | 2024-08-16 | E8_T02 | -35.9495 | -61.5309 | 0.7876 | 0.0420 | 8.6717 |
| LittleHopeLH1 | 2024-08-16 | E8_T03 | -35.9495 | -60.3445 | 0.8641 | 0.0503 | 11.3958 |
| LittleHopeLH1 | 2024-08-16 | E8_T04 | -35.9495 | -56.8218 | 1.0056 | 0.0973 | 25.6456 |
| LittleHopeLH1 | 2024-08-16 | E8_T05 | -35.9495 | -59.2504 | 1.0872 | 0.0515 | 14.6606 |
| LittleHopeLH1 | 2024-08-16 | E8_T06 | -35.9495 | -51.6616 | 1.9024 | 0.1688 | 84.1474 |
| LittleHopeLH1 | 2024-08-16 | E8_T07 | -35.9495 | -53.2430 | 1.8338 | 0.1217 | 58.4648 |
| LittleHopeLH1 | 2024-08-16 | E8_T08 | -35.9495 | -53.7032 | 2.1206 | 0.0946 | 52.5870 |
| LittleHopeLH1 | 2024-08-16 | E8_T09 | -35.9495 | -61.9291 | 1.0591 | 0.0285 | 7.9120 |
| LittleHopeLH1 | 2024-08-16 | E8_T10 | -35.9495 | -79.2471 | 0.8874 | 0.0006 | 0.1467 |
| LittleHopeLH2 | 2024-08-16 | SH_T01 | -35.9495 | -50.7350 | 1.3077 | 0.2201 | 87.6429 |
| LittleHopeLH2 | 2024-08-16 | SH_T02 | -35.9495 | -46.1000 | 1.4204 | 0.5892 | 254.8089 |
| LittleHopeLH2 | 2024-08-16 | SH_T03 | -35.9495 | -47.6631 | 1.7023 | 0.3430 | 177.7906 |
| LittleHopeLH2 | 2024-08-16 | SH_T04 | -35.9495 | -48.5611 | 1.9064 | 0.2491 | 144.5788 |
| LittleHopeLH2 | 2024-08-16 | SH_T05 | -35.9495 | -53.4817 | 1.9185 | 0.0797 | 46.5637 |
| LittleHopeLH2 | 2024-08-16 | SH_T06 | -35.9495 | -82.6925 | 0.4084 | 0.0004 | 0.0558 |
| LittleHopeLH3 | 2024-08-16 | BT_T01 | -35.9495 | -56.2660 | 2.7048 | 0.1158 | 84.3069 |
| LittleHopeLH3 | 2024-08-16 | BT_T02 | -35.9495 | -50.3056 | 2.8208 | 0.4379 | 332.5846 |
| LittleHopeLH3 | 2024-08-16 | BT_T03 | -35.9495 | -49.8177 | 3.4457 | 0.4011 | 372.1270 |
| LittleHopeLH3 | 2024-08-16 | BT_T04 | -35.9495 | -47.7597 | 3.8773 | 0.5725 | 597.7095 |
| LittleHopeLH3 | 2024-08-16 | BT_T05 | -35.9495 | -48.1988 | 3.8795 | 0.5172 | 540.2313 |
| LittleHopeLH3 | 2024-08-16 | BT_T06 | -35.9495 | -44.5129 | 4.3442 | 1.0792 | 1,262.3189 |
| LittleHopeLH3 | 2024-08-16 | BT_T07 | -35.9495 | -47.2952 | 4.1821 | 0.5907 | 665.1791 |
| LittleHopeLH3 | 2024-08-16 | BT_T08 | -35.9495 | -55.0416 | 3.5106 | 0.1182 | 111.7634 |
| LittleHopeLH3 | 2024-08-16 | BT_T09 | -35.9495 | -58.3745 | 3.3308 | 0.0578 | 51.8816 |
| LittleHopeLH3 | 2024-08-16 | BT_T10 | -35.9495 | -81.0954 | 1.5828 | 0.0007 | 0.2773 |
| LittleHopeLH4 | 2024-08-16 | AS_T01 | -35.9495 | -47.8540 | 1.5986 | 0.3147 | 99.5380 |
| LittleHopeLH4 | 2024-08-16 | AS_T02 | -35.9495 | -45.2154 | 1.9986 | 0.4622 | 182.7468 |
| LittleHopeLH4 | 2024-08-16 | AS_T03 | -35.9495 | -50.2900 | 2.0645 | 0.1391 | 56.8049 |
| LittleHopeLH4 | 2024-08-16 | AS_T04 | -35.9495 | -51.9385 | 2.1391 | 0.0918 | 38.8631 |
| LittleHopeLH5 | 2024-08-16 | AS_T05 | -35.9495 | -52.9067 | 1.3833 | 0.0862 | 47.2226 |
| LittleHopeLH5 | 2024-08-16 | AS_T06 | -35.9495 | -44.4817 | 4.5370 | 0.1830 | 328.5863 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-08-27 | E8_T01 | -35.9209 | -46.1287 | 1.4852 | 0.7153 | 231.8565 |
| LittleHopeLH1 | 2024-08-27 | E8_T02 | -35.9209 | -54.2315 | 1.8328 | 0.0897 | 35.8872 |
| LittleHopeLH1 | 2024-08-27 | E8_T03 | -35.9209 | -49.9221 | 1.6556 | 0.2679 | 96.8000 |
| LittleHopeLH1 | 2024-08-27 | E8_T04 | -35.9209 | -57.1760 | 1.6059 | 0.0520 | 18.2173 |
| LittleHopeLH1 | 2024-08-27 | E8_T05 | -35.9209 | -48.2067 | 1.8921 | 0.3479 | 143.6859 |
| LittleHopeLH1 | 2024-08-27 | E8_T06 | -35.9209 | -60.6888 | 1.5301 | 0.0243 | 8.1134 |
| LittleHopeLH1 | 2024-08-27 | E8_T07 | -35.9209 | -55.0076 | 1.1426 | 0.1204 | 30.0141 |
| LittleHopeLH2 | 2024-08-27 | SH_T01 | -35.9209 | -53.3861 | 1.0567 | 0.1757 | 74.3729 |
| LittleHopeLH2 | 2024-08-27 | SH_T02 | -35.9209 | -57.3501 | 1.6873 | 0.0442 | 29.8549 |
| LittleHopeLH2 | 2024-08-27 | SH_T03 | -35.9209 | -59.3901 | 2.5910 | 0.0180 | 18.6644 |
| LittleHopeLH2 | 2024-08-27 | SH_T04 | -35.9209 | -66.1344 | 3.0937 | 0.0032 | 3.9499 |
| LittleHopeLH2 | 2024-08-27 | SH_T05 | -35.9209 | -69.1090 | 1.9284 | 0.0026 | 1.9912 |
| LittleHopeLH3 | 2024-08-27 | BT_T01 | -35.9209 | -42.0646 | 0.9186 | 0.7711 | 170.4571 |
| LittleHopeLH3 | 2024-08-27 | BT_T02 | -35.9209 | -36.4129 | 1.0039 | 2.5924 | 626.2991 |
| LittleHopeLH3 | 2024-08-27 | BT_T03 | -35.9209 | -50.3143 | 0.9921 | 0.1068 | 25.5057 |
| LittleHopeLH4 | 2024-08-27 | AS_T01 | -35.9209 | -54.7910 | 0.7914 | 0.0926 | 15.3390 |
| LittleHopeLH4 | 2024-08-27 | AS_T02 | -35.9209 | -53.0857 | 1.0096 | 0.1075 | 22.7158 |
| LittleHopeLH4 | 2024-08-27 | AS_T03 | -35.9209 | -48.3723 | 1.1789 | 0.2726 | 67.2469 |
| LittleHopeLH4 | 2024-08-27 | AS_T04 | -35.9209 | -55.6431 | 1.2848 | 0.0469 | 12.6063 |
| LittleHopeLH4 | 2024-08-27 | AS_T05 | -35.9209 | -56.2270 | 1.3856 | 0.0380 | 11.0205 |
| LittleHopeLH5 | 2024-08-27 | AS_T06 | -35.9209 | -47.8023 | 2.1620 | 0.7301 | 745.7182 |
| LittleHopeLH5 | 2024-08-27 | AS_T07 | -35.9209 | -48.8378 | 2.2711 | 0.5476 | 587.5174 |
| LittleHopeLH5 | 2024-08-27 | AS_T08 | -35.9209 | -45.9730 | 2.1671 | 1.1100 | 1,136.3225 |
| LittleHopeLH5 | 2024-08-27 | AS_T09 | -35.9209 | -52.4613 | 2.3973 | 0.2252 | 255.0760 |
| LittleHopeLH5 | 2024-08-27 | AS_T10 | -35.9209 | -49.9992 | 2.6366 | 0.3610 | 449.6572 |
| LittleHopeLH5 | 2024-08-27 | AS_T11 | -35.9209 | -49.3202 | 3.0380 | 0.3663 | 525.7506 |
| LittleHopeLH5 | 2024-08-27 | AS_T12 | -35.9209 | -50.5834 | 3.1141 | 0.2672 | 393.0671 |
| LittleHopeLH5 | 2024-08-27 | AS_T13 | -35.9209 | -60.9525 | 3.4735 | 0.0220 | 36.1034 |
| LittleHopeLH5 | 2024-08-27 | AS_T14 | -35.9209 | -70.6684 | 3.0850 | 0.0026 | 3.8545 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-09-06 | E8_T01 | -35.8429 | -45.0885 | 0.9569 | 0.9446 | 206.3352 |
| LittleHopeLH1 | 2024-09-06 | E8_T02 | -35.8429 | -45.2247 | 0.7865 | 1.1139 | 199.9648 |
| LittleHopeLH1 | 2024-09-06 | E8_T03 | -35.8429 | -40.6854 | 1.2891 | 1.9326 | 568.7021 |
| LittleHopeLH1 | 2024-09-06 | E8_T04 | -35.8429 | -42.3758 | 1.2506 | 1.3498 | 385.3408 |
| LittleHopeLH1 | 2024-09-06 | E8_T05 | -35.8429 | -47.9734 | 1.5330 | 0.3035 | 106.1898 |
| LittleHopeLH1 | 2024-09-06 | E8_T06 | -35.8429 | -51.5298 | 1.1235 | 0.1826 | 46.8213 |
| LittleHopeLH1 | 2024-09-06 | E8_T07 | -35.8429 | -70.1014 | 0.6585 | 0.0043 | 0.6506 |
| LittleHopeLH2 | 2024-09-06 | E2_T01 | -35.8429 | -49.1446 | 2.3881 | 0.2158 | 235.0488 |
| LittleHopeLH2 | 2024-09-06 | E2_T02 | -35.8429 | -46.0798 | 2.1951 | 0.4754 | 476.0253 |
| LittleHopeLH2 | 2024-09-06 | E2_T03 | -35.8429 | -43.5519 | 2.3158 | 0.8065 | 851.9719 |
| LittleHopeLH2 | 2024-09-06 | E2_T04 | -35.8429 | -51.5841 | 1.6326 | 0.1800 | 134.0290 |
| LittleHopeLH2 | 2024-09-06 | E2_T05 | -35.8429 | -83.5433 | 1.1884 | 0.0002 | 0.0854 |
| LittleHopeLH2 | 2024-09-06 | E2_T06 | -35.8429 | -78.3724 | 1.3009 | 0.0005 | 0.2808 |
| LittleHopeLH3 | 2024-09-06 | BT_T01 | -35.8429 | -57.3940 | 1.2302 | 0.0882 | 39.1739 |
| LittleHopeLH3 | 2024-09-06 | BT_T02 | -35.8429 | -50.5620 | 1.5222 | 0.3438 | 188.8846 |
| LittleHopeLH3 | 2024-09-06 | BT_T03 | -35.8429 | -45.1230 | 1.9727 | 0.9282 | 660.8459 |
| LittleHopeLH3 | 2024-09-06 | BT_T04 | -35.8429 | -42.4780 | 2.1827 | 1.5424 | 1,215.0585 |
| LittleHopeLH3 | 2024-09-06 | BT_T05 | -35.8429 | -42.7529 | 2.5893 | 1.2205 | 1,140.5436 |
| LittleHopeLH3 | 2024-09-06 | BT_T06 | -35.8429 | -45.1250 | 2.7474 | 0.6662 | 660.5401 |
| LittleHopeLH3 | 2024-09-06 | BT_T07 | -35.8429 | -51.0051 | 2.5639 | 0.1843 | 170.5634 |
| LittleHopeLH3 | 2024-09-06 | BT_T08 | -35.8429 | -56.2765 | 0.7049 | 0.1992 | 50.6697 |
| LittleHopeLH4 | 2024-09-06 | BT_T09 | -35.8429 | -63.7143 | 1.2196 | 0.0274 | 11.5717 |
| LittleHopeLH4 | 2024-09-06 | BT_T10 | -35.8429 | -54.1919 | 2.0790 | 0.1442 | 103.6665 |
| LittleHopeLH4 | 2024-09-06 | BT_T11 | -35.8429 | -47.6049 | 1.9052 | 0.7171 | 472.4307 |
| LittleHopeLH4 | 2024-09-06 | BT_T12 | -35.8429 | -46.2059 | 2.4998 | 0.7542 | 651.9857 |
| LittleHopeLH4 | 2024-09-06 | BT_T13 | -35.8429 | -44.0017 | 3.0311 | 1.0332 | 1,083.0685 |
| LittleHopeLH4 | 2024-09-06 | BT_T14 | -35.8429 | -45.9897 | 3.1259 | 0.6339 | 685.2549 |
| LittleHopeLH4 | 2024-09-06 | BT_T15 | -35.8429 | -50.4762 | 2.6062 | 0.2706 | 243.8947 |
| LittleHopeLH4 | 2024-09-06 | BT_T16 | -35.8429 | -52.8539 | 3.0848 | 0.1322 | 141.0696 |
| LittleHopeLH4 | 2024-09-06 | BT_T17 | -35.8429 | -59.8915 | 0.9453 | 0.0854 | 27.9046 |
| LittleHopeLH5 | 2024-09-06 | SH_T01 | -35.8429 | -52.5203 | 1.0480 | 0.3019 | 116.5214 |
| LittleHopeLH5 | 2024-09-06 | SH_T02 | -35.8429 | -52.5451 | 1.2689 | 0.2479 | 115.8576 |
| LittleHopeLH5 | 2024-09-06 | SH_T03 | -35.8429 | -51.1032 | 2.2261 | 0.1969 | 161.4820 |
| LittleHopeLH5 | 2024-09-06 | SH_T04 | -35.8429 | -52.9945 | 1.7831 | 0.1591 | 104.4698 |
| LittleHopeLH5 | 2024-09-06 | SH_T05 | -35.8429 | -50.4506 | 1.9867 | 0.2564 | 187.6623 |
| LittleHopeLH5 | 2024-09-06 | SH_T06 | -35.8429 | -50.5943 | 1.6974 | 0.2904 | 181.5543 |
| LittleHopeLH5 | 2024-09-06 | SH_T07 | -35.8429 | -56.0538 | 2.0599 | 0.0681 | 51.6483 |
| LittleHopeLH5 | 2024-09-06 | SH_T08 | -35.8429 | -52.7897 | 1.7783 | 0.1672 | 109.5150 |
| LittleHopeLH5 | 2024-09-06 | SH_T09 | -35.8429 | -51.0413 | 0.8716 | 0.5102 | 163.7994 |
| LittleHopeLH6 | 2024-09-06 | SH_T10 | -35.8429 | -56.8596 | 1.3147 | 0.0438 | 11.6806 |
| LittleHopeLH6 | 2024-09-06 | SH_T11 | -35.8429 | -54.2185 | 1.4760 | 0.0716 | 21.4573 |
| LittleHopeLH6 | 2024-09-06 | SH_T12 | -35.8429 | -43.9946 | 1.5758 | 0.7062 | 225.9231 |
| LittleHopeLH6 | 2024-09-06 | SH_T13 | -35.8429 | -48.6966 | 1.5345 | 0.2456 | 76.5176 |
| LittleHopeLH6 | 2024-09-06 | SH_T14 | -35.8429 | -61.4127 | 1.3704 | 0.0147 | 4.0940 |
| LittleHopeLH7 | 2024-09-06 | AS_T01 | -35.8429 | -47.2322 | 2.5330 | 0.7377 | 603.6131 |
| LittleHopeLH7 | 2024-09-06 | AS_T02 | -35.8429 | -43.9104 | 3.9172 | 1.0250 | 1,296.9965 |
| LittleHopeLH7 | 2024-09-06 | AS_T03 | -35.8429 | -42.0406 | 4.4181 | 1.3977 | 1,994.8682 |
| LittleHopeLH7 | 2024-09-06 | AS_T04 | -35.8429 | -41.4304 | 3.7965 | 1.8719 | 2,295.8024 |
| LittleHopeLH7 | 2024-09-06 | AS_T05 | -35.8429 | -48.7270 | 2.2207 | 0.5964 | 427.8412 |
| LittleHopeLH7 | 2024-09-06 | AS_T06 | -35.8429 | -47.3859 | 2.5575 | 0.7052 | 582.6231 |
| LittleHopeLH7 | 2024-09-06 | AS_T07 | -35.8429 | -49.6035 | 2.9484 | 0.3671 | 349.6421 |
| LittleHopeLH7 | 2024-09-06 | AS_T08 | -35.8429 | -51.8737 | 3.3380 | 0.1922 | 207.3061 |
| LittleHopeLH8 | 2024-09-06 | AS_T09 | -35.8429 | -48.9315 | 1.4242 | 0.3816 | 207.3737 |
| LittleHopeLH8 | 2024-09-06 | AS_T10 | -35.8429 | -47.1774 | 1.7172 | 0.4741 | 310.5687 |
| LittleHopeLH8 | 2024-09-06 | AS_T11 | -35.8429 | -50.3689 | 2.1314 | 0.1832 | 148.9395 |
| LittleHopeLH8 | 2024-09-06 | AS_T12 | -35.8429 | -57.5363 | 1.5584 | 0.0481 | 28.5938 |
| LittleHopeLH8 | 2024-09-06 | AS_T13 | -35.8429 | -53.9403 | 1.6054 | 0.1068 | 65.4440 |
| LittleHopeLH8 | 2024-09-06 | AS_T14 | -35.8429 | -58.3390 | 1.1802 | 0.0528 | 23.7683 |
| LittleHopeLH8 | 2024-09-06 | AS_T15 | -35.8429 | -59.7020 | 1.4517 | 0.0314 | 17.3661 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-09-16 | AS_T01 | -35.86 | -70.7495 | 2.3305 | 0.0051 | 5.8345 |
| LittleHopeLH1 | 2024-09-16 | AS_T02 | -35.86 | -67.7416 | 2.6788 | 0.0089 | 11.6624 |
| LittleHopeLH1 | 2024-09-16 | AS_T03 | -35.86 | -61.1271 | 3.0034 | 0.0362 | 53.4865 |
| LittleHopeLH1 | 2024-09-16 | AS_T04 | -35.86 | -54.2294 | 3.2853 | 0.1621 | 261.8276 |
| LittleHopeLH1 | 2024-09-16 | AS_T05 | -35.86 | -51.0602 | 3.8619 | 0.2861 | 543.1689 |
| LittleHopeLH1 | 2024-09-16 | AS_T06 | -35.86 | -51.5277 | 3.7567 | 0.2641 | 487.7285 |
| LittleHopeLH1 | 2024-09-16 | AS_T07 | -35.86 | -52.8610 | 4.3363 | 0.1683 | 358.8026 |
| LittleHopeLH1 | 2024-09-16 | AS_T08 | -35.86 | -55.3694 | 4.2352 | 0.0967 | 201.3778 |
| LittleHopeLH1 | 2024-09-16 | AS_T09 | -35.86 | -60.4360 | 3.9785 | 0.0321 | 62.7117 |
| LittleHopeLH1 | 2024-09-16 | AS_T10 | -35.86 | -64.6724 | 3.1879 | 0.0151 | 23.6434 |
| LittleHopeLH1 | 2024-09-16 | AS_T11 | -35.86 | -65.6452 | 1.9376 | 0.0198 | 18.8989 |
| LittleHopeLH2 | 2024-09-16 | BT_T01 | -35.86 | -77.7711 | 0.9608 | 0.0016 | 0.4760 |
| LittleHopeLH2 | 2024-09-16 | BT_T02 | -35.86 | -72.1118 | 1.7232 | 0.0032 | 1.7520 |
| LittleHopeLH2 | 2024-09-16 | BT_T03 | -35.86 | -64.1393 | 1.9261 | 0.0181 | 10.9843 |
| LittleHopeLH2 | 2024-09-16 | BT_T04 | -35.86 | -60.4367 | 2.0617 | 0.0397 | 25.7651 |
| LittleHopeLH2 | 2024-09-16 | BT_T05 | -35.86 | -58.9755 | 2.1932 | 0.0523 | 36.0707 |
| LittleHopeLH2 | 2024-09-16 | BT_T06 | -35.86 | -54.9473 | 1.8840 | 0.1540 | 91.1966 |
| LittleHopeLH2 | 2024-09-16 | BT_T07 | -35.86 | -55.3754 | 2.1148 | 0.1243 | 82.6350 |
| LittleHopeLH2 | 2024-09-16 | BT_T08 | -35.86 | -56.6608 | 2.1104 | 0.0926 | 61.4649 |
| LittleHopeLH2 | 2024-09-16 | BT_T09 | -35.86 | -57.8831 | 1.8934 | 0.0779 | 46.3863 |
| LittleHopeLH2 | 2024-09-16 | BT_T10 | -35.86 | -57.6240 | 1.8226 | 0.0859 | 49.2386 |
| LittleHopeLH2 | 2024-09-16 | BT_T11 | -35.86 | -56.8634 | 1.4381 | 0.1298 | 58.6624 |
| LittleHopeLH2 | 2024-09-16 | BT_T12 | -35.86 | -60.1460 | 1.1741 | 0.0746 | 27.5487 |
| LittleHopeLH2 | 2024-09-16 | BT_T13 | -35.86 | -60.4441 | 0.8334 | 0.0982 | 25.7212 |
| LittleHopeLH2 | 2024-09-16 | BT_T14 | -35.86 | -59.4025 | 0.8704 | 0.1195 | 32.6927 |
| LittleHopeLH2 | 2024-09-16 | BT_T15 | -35.86 | -64.8294 | 0.5025 | 0.0593 | 9.3704 |
| LittleHopeLH3 | 2024-09-16 | BT_T16 | -35.86 | -56.5660 | 0.9413 | 0.1194 | 47.5170 |
| LittleHopeLH3 | 2024-09-16 | BT_T17 | -35.86 | -51.1836 | 1.5196 | 0.2553 | 164.0902 |
| LittleHopeLH3 | 2024-09-16 | BT_T18 | -35.86 | -50.3931 | 1.6453 | 0.2829 | 196.8487 |
| LittleHopeLH3 | 2024-09-16 | BT_T19 | -35.86 | -53.2267 | 1.6288 | 0.1488 | 102.5123 |
| LittleHopeLH3 | 2024-09-16 | BT_T20 | -35.86 | -53.3807 | 1.7463 | 0.1340 | 98.9414 |
| LittleHopeLH3 | 2024-09-16 | BT_T21 | -35.86 | -53.4199 | 1.9125 | 0.1212 | 98.0508 |
| LittleHopeLH3 | 2024-09-16 | BT_T22 | -35.86 | -55.2974 | 1.8672 | 0.0806 | 63.6359 |
| LittleHopeLH3 | 2024-09-16 | BT_T23 | -35.86 | -56.3606 | 1.9572 | 0.0602 | 49.8178 |
| LittleHopeLH4 | 2024-09-16 | E8_T01 | -35.86 | -53.9680 | 1.6320 | 0.1123 | 50.9928 |
| LittleHopeLH4 | 2024-09-16 | E8_T02 | -35.86 | -50.6722 | 1.7821 | 0.2196 | 108.9157 |
| LittleHopeLH4 | 2024-09-16 | E8_T03 | -35.86 | -53.4721 | 1.3612 | 0.1509 | 57.1619 |
| LittleHopeLH4 | 2024-09-16 | E8_T04 | -35.86 | -51.6289 | 1.2617 | 0.2489 | 87.3830 |
| LittleHopeLH4 | 2024-09-16 | E8_T05 | -35.86 | -53.3038 | 1.6631 | 0.1284 | 59.4206 |
| LittleHopeLH4 | 2024-09-16 | E8_T06 | -35.86 | -51.8336 | 1.8591 | 0.1611 | 83.3594 |
| LittleHopeLH4 | 2024-09-16 | E8_T07 | -35.86 | -54.2517 | 1.6228 | 0.1058 | 47.7682 |
| LittleHopeLH4 | 2024-09-16 | E8_T08 | -35.86 | -59.1049 | 0.6722 | 0.0835 | 15.6249 |
| LittleHopeLH5 | 2024-09-16 | E8_T09 | -35.86 | -56.1075 | 0.7908 | 0.2467 | 57.4928 |
| LittleHopeLH5 | 2024-09-16 | E8_T10 | -35.86 | -54.4661 | 1.1558 | 0.2463 | 83.8987 |
| LittleHopeLH5 | 2024-09-16 | E8_T11 | -35.86 | -50.9363 | 2.3521 | 0.2728 | 189.1207 |
| LittleHopeLH5 | 2024-09-16 | E8_T12 | -35.86 | -48.9230 | 2.5227 | 0.4044 | 300.6508 |
| LittleHopeLH5 | 2024-09-16 | E8_T13 | -35.86 | -50.8045 | 3.0446 | 0.2173 | 194.9483 |
| LittleHopeLH5 | 2024-09-16 | E8_T14 | -35.86 | -52.2095 | 2.8161 | 0.1700 | 141.0654 |
| LittleHopeLH5 | 2024-09-16 | E8_T15 | -35.86 | -51.4948 | 2.8619 | 0.1972 | 166.2987 |
| LittleHopeLH5 | 2024-09-16 | E8_T16 | -35.86 | -52.8167 | 2.6196 | 0.1589 | 122.6575 |
| LittleHopeLH5 | 2024-09-16 | E8_T17 | -35.86 | -53.1070 | 2.4874 | 0.1565 | 114.7285 |
| LittleHopeLH6 | 2024-09-16 | E8_T18 | -35.86 | -47.9341 | 1.8559 | 0.5360 | 327.0522 |
| LittleHopeLH6 | 2024-09-16 | E8_T19 | -35.86 | -47.5168 | 2.0011 | 0.5473 | 360.0363 |
| LittleHopeLH6 | 2024-09-16 | E8_T20 | -35.86 | -48.2559 | 2.0346 | 0.4540 | 303.6986 |
| LittleHopeLH6 | 2024-09-16 | E8_T21 | -35.86 | -49.8841 | 1.6204 | 0.3919 | 208.7487 |
| LittleHopeLH6 | 2024-09-16 | E8_T22 | -35.86 | -52.2858 | 1.7007 | 0.2148 | 120.0749 |
| LittleHopeLH6 | 2024-09-16 | E8_T23 | -35.86 | -49.2757 | 1.8503 | 0.3948 | 240.1369 |
| LittleHopeLH6 | 2024-09-16 | E8_T24 | -35.86 | -44.6967 | 2.8966 | 0.7238 | 689.2217 |
| LittleHopeLH6 | 2024-09-16 | E8_T25 | -35.86 | -56.4653 | 2.0786 | 0.0671 | 45.8672 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-09-26 | E8_T01 | -36.0139 | -57.5385 | 0.7668 | 0.0940 | 28.8860 |
| LittleHopeLH1 | 2024-09-26 | E8_T02 | -36.0139 | -46.3692 | 1.4681 | 0.6428 | 378.1092 |
| LittleHopeLH1 | 2024-09-26 | E8_T03 | -36.0139 | -45.8033 | 2.3587 | 0.4558 | 430.7318 |
| LittleHopeLH1 | 2024-09-26 | E8_T04 | -36.0139 | -46.5658 | 2.0838 | 0.4328 | 361.3731 |
| LittleHopeLH1 | 2024-09-26 | E8_T05 | -36.0139 | -48.7212 | 2.2906 | 0.2397 | 219.9982 |
| LittleHopeLH1 | 2024-09-26 | E8_T06 | -36.0139 | -54.4093 | 1.2735 | 0.1164 | 59.3753 |
| LittleHopeLH2 | 2024-09-26 | AS_T01 | -36.0139 | -52.0055 | 1.0623 | 0.1344 | 31.3600 |
| LittleHopeLH2 | 2024-09-26 | AS_T02 | -36.0139 | -47.7597 | 1.4927 | 0.2542 | 83.3610 |
| LittleHopeLH2 | 2024-09-26 | AS_T03 | -36.0139 | -50.0324 | 1.5119 | 0.1487 | 49.3965 |
| LittleHopeLH2 | 2024-09-26 | AS_T04 | -36.0139 | -54.2808 | 1.6043 | 0.0527 | 18.5715 |
| LittleHopeLH3 | 2024-09-26 | AS_T05 | -36.0139 | -74.7616 | 0.8232 | 0.0015 | 0.2313 |
| LittleHopeLH3 | 2024-09-26 | AS_T06 | -36.0139 | -71.2577 | 0.9832 | 0.0028 | 0.5183 |
| LittleHopeLH3 | 2024-09-26 | AS_T07 | -36.0139 | -49.4140 | 0.8894 | 0.4680 | 79.2396 |
| LittleHopeLH3 | 2024-09-26 | AS_T08 | -36.0139 | -38.6735 | 1.3111 | 3.7651 | 939.7221 |
| LittleHopeLH3 | 2024-09-26 | AS_T09 | -36.0139 | -40.9730 | 1.4870 | 1.9550 | 553.4102 |
| LittleHopeLH3 | 2024-09-26 | AS_T10 | -36.0139 | -42.2153 | 1.7696 | 1.2341 | 415.7379 |
| LittleHopeLH3 | 2024-09-26 | AS_T11 | -36.0139 | -50.5577 | 1.8433 | 0.1735 | 60.8946 |
| LittleHopeLH4 | 2024-09-26 | E8_T01 | -36.0139 | -57.5385 | 0.7668 | 0.0940 | 28.8860 |
| LittleHopeLH4 | 2024-09-26 | E8_T02 | -36.0139 | -46.3692 | 1.4681 | 0.6428 | 378.1092 |
| LittleHopeLH4 | 2024-09-26 | E8_T03 | -36.0139 | -45.8033 | 2.3587 | 0.4558 | 430.7318 |
| LittleHopeLH4 | 2024-09-26 | E8_T04 | -36.0139 | -46.5658 | 2.0838 | 0.4328 | 361.3731 |
| LittleHopeLH4 | 2024-09-26 | E8_T05 | -36.0139 | -48.7212 | 2.2906 | 0.2397 | 219.9982 |
| LittleHopeLH4 | 2024-09-26 | E8_T06 | -36.0139 | -54.4093 | 1.2735 | 0.1164 | 59.3753 |
| LittleHopeLH5 | 2024-09-26 | SH_T04 | -36.0139 | -54.2230 | 6.8367 | 0.0531 | 451.3854 |
| LittleHopeLH5 | 2024-09-26 | SH_T05 | -36.0139 | -55.3887 | 5.3775 | 0.0516 | 345.1262 |
| LittleHopeLH5 | 2024-09-26 | SH_T06 | -36.0139 | -55.1492 | 7.1802 | 0.0408 | 364.6887 |
| LittleHopeLH5 | 2024-09-26 | SH_T07 | -36.0139 | -60.9939 | 4.6286 | 0.0165 | 94.9415 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-10-10 | AS_T01 | -35.6942 | -57.0818 | 2.0038 | 0.0723 | 37.3121 |
| LittleHopeLH1 | 2024-10-10 | AS_T02 | -35.6942 | -54.8022 | 1.9582 | 0.1250 | 63.0684 |
| LittleHopeLH1 | 2024-10-10 | AS_T03 | -35.6942 | -56.2918 | 1.9324 | 0.0899 | 44.7560 |
| LittleHopeLH1 | 2024-10-10 | AS_T04 | -35.6942 | -57.2647 | 1.5978 | 0.0869 | 35.7734 |
| LittleHopeLH1 | 2024-10-10 | AS_T05 | -35.6942 | -58.8978 | 1.4983 | 0.0636 | 24.5614 |
| LittleHopeLH1 | 2024-10-10 | AS_T06 | -35.6942 | -56.4862 | 1.3999 | 0.1187 | 42.7965 |
| LittleHopeLH1 | 2024-10-10 | AS_T08 | -35.6942 | -56.6409 | 2.0973 | 0.0764 | 41.2988 |
| LittleHopeLH1 | 2024-10-10 | AS_T09 | -35.6942 | -65.5382 | 2.1974 | 0.0094 | 5.3236 |
| LittleHopeLH1 | 2024-10-10 | AS_T10 | -35.6942 | -63.5587 | 2.6606 | 0.0122 | 8.3977 |
| LittleHopeLH1 | 2024-10-10 | AS_T11 | -35.6942 | -67.5784 | 2.5870 | 0.0050 | 3.3281 |
| LittleHopeLH2 | 2024-10-10 | AS_T12 | -35.6942 | -56.3098 | 4.1269 | 0.0517 | 198.6780 |
| LittleHopeLH2 | 2024-10-10 | AS_T13 | -35.6942 | -57.2333 | 3.5576 | 0.0484 | 160.6206 |
| LittleHopeLH2 | 2024-10-10 | AS_T14 | -35.6942 | -56.5051 | 4.0018 | 0.0509 | 189.9434 |
| LittleHopeLH2 | 2024-10-10 | AS_T15 | -35.6942 | -61.2073 | 3.6521 | 0.0189 | 64.3280 |
| LittleHopeLH2 | 2024-10-10 | AS_T16 | -35.6942 | -56.4664 | 6.1115 | 0.0337 | 191.6439 |
| LittleHopeLH2 | 2024-10-10 | AS_T17 | -35.6942 | -68.4050 | 1.5042 | 0.0087 | 12.2641 |
| LittleHopeLH2 | 2024-10-10 | AS_T18 | -35.6942 | -66.1614 | 1.6130 | 0.0137 | 20.5587 |
| LittleHopeLH3 | 2024-10-10 | BT_T01 | -35.6942 | -64.2133 | 0.4415 | 0.0290 | 5.1963 |
| LittleHopeLH3 | 2024-10-10 | BT_T02 | -35.6942 | -55.5244 | 1.3685 | 0.0691 | 38.4227 |
| LittleHopeLH3 | 2024-10-10 | BT_T03 | -35.6942 | -51.8906 | 1.5428 | 0.1415 | 88.7086 |
| LittleHopeLH3 | 2024-10-10 | BT_T04 | -35.6942 | -52.7062 | 1.7297 | 0.1046 | 73.5194 |
| LittleHopeLH3 | 2024-10-10 | BT_T05 | -35.6942 | -51.6502 | 1.7467 | 0.1321 | 93.7570 |
| LittleHopeLH3 | 2024-10-10 | BT_T06 | -35.6942 | -53.0335 | 1.8175 | 0.0923 | 68.1837 |
| LittleHopeLH3 | 2024-10-10 | BT_T08 | -35.6942 | -61.7113 | 0.4456 | 0.0511 | 9.2448 |
| LittleHopeLH4 | 2024-10-10 | BT_T09 | -35.6942 | -80.8957 | 0.2872 | 0.0004 | 0.0240 |
| LittleHopeLH4 | 2024-10-10 | BT_T10 | -35.6942 | -67.8755 | 0.4896 | 0.0045 | 0.4816 |
| LittleHopeLH4 | 2024-10-10 | BT_T11 | -35.6942 | -63.6442 | 0.6327 | 0.0092 | 1.2760 |
| LittleHopeLH4 | 2024-10-10 | BT_T12 | -35.6942 | -42.3628 | 0.7976 | 0.9759 | 171.3942 |
| LittleHopeLH4 | 2024-10-10 | BT_T13 | -35.6942 | -54.4682 | 0.9708 | 0.0494 | 10.5548 |
| LittleHopeLH4 | 2024-10-10 | BT_T14 | -35.6942 | -63.1379 | 0.4365 | 0.0149 | 1.4338 |
| LittleHopeLH5 | 2024-10-10 | SH_T01 | -35.6942 | -61.7835 | 0.9187 | 0.0107 | 2.2189 |
| LittleHopeLH5 | 2024-10-10 | SH_T02 | -35.6942 | -58.1682 | 1.4961 | 0.0150 | 5.1011 |
| LittleHopeLH5 | 2024-10-10 | SH_T03 | -35.6942 | -52.1448 | 1.5650 | 0.0576 | 20.4175 |
| LittleHopeLH6 | 2024-10-10 | SH_T04 | -35.6942 | -54.5317 | 1.4813 | 0.0314 | 10.6099 |
| LittleHopeLH6 | 2024-10-10 | SH_T05 | -35.6942 | -56.1521 | 1.3616 | 0.0235 | 7.3059 |
| LittleHopeLH6 | 2024-10-10 | SH_T06 | -35.6942 | -57.1259 | 0.7149 | 0.0358 | 5.8383 |
| LittleHopeLH7 | 2024-10-10 | SH_T07 | -35.6942 | -56.2963 | 2.8393 | 0.0808 | 111.8353 |
| LittleHopeLH7 | 2024-10-10 | SH_T08 | -35.6942 | -56.4016 | 3.3277 | 0.0673 | 109.1552 |
| LittleHopeLH7 | 2024-10-10 | SH_T09 | -35.6942 | -57.1111 | 3.7938 | 0.0501 | 92.7043 |
| LittleHopeLH7 | 2024-10-10 | SH_T10 | -35.6942 | -56.1868 | 4.0233 | 0.0585 | 114.6901 |
| LittleHopeLH7 | 2024-10-10 | SH_T11 | -35.6942 | -58.6877 | 4.0806 | 0.0324 | 64.4815 |
| LittleHopeLH7 | 2024-10-10 | SH_T12 | -35.6942 | -57.8986 | 4.0892 | 0.0388 | 77.3306 |
| LittleHopeLH7 | 2024-10-10 | SH_T13 | -35.6942 | -59.7733 | 4.1944 | 0.0246 | 50.2206 |
| LittleHopeLH8 | 2024-10-10 | SH_T14 | -35.6942 | -57.3278 | 2.8302 | 0.0391 | 56.0885 |
| LittleHopeLH8 | 2024-10-10 | SH_T15 | -35.6942 | -58.7260 | 3.2419 | 0.0247 | 40.6492 |
| LittleHopeLH8 | 2024-10-10 | SH_T16 | -35.6942 | -57.7506 | 2.8034 | 0.0358 | 50.8853 |
| LittleHopeLH8 | 2024-10-10 | SH_T17 | -35.6942 | -60.9075 | 2.2291 | 0.0218 | 24.5981 |
| LittleHopeLH8 | 2024-10-10 | SH_T18 | -35.6942 | -58.7009 | 1.8609 | 0.0433 | 40.8853 |
| LittleHopeLH8 | 2024-10-10 | SH_T19 | -35.6942 | -60.5324 | 1.8514 | 0.0286 | 26.8176 |
| LittleHopeLH8 | 2024-10-10 | SH_T20 | -35.6942 | -63.2679 | 1.3022 | 0.0216 | 14.2846 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-10-21 | BT_T01 | -36.0444 | -61.9553 | 0.4911 | 0.0134 | 1.5936 |
| LittleHopeLH1 | 2024-10-21 | BT_T02 | -36.0444 | -56.0878 | 0.8381 | 0.0303 | 6.1534 |
| LittleHopeLH1 | 2024-10-21 | BT_T03 | -36.0444 | -55.2493 | 1.1187 | 0.0276 | 7.4640 |
| LittleHopeLH1 | 2024-10-21 | BT_T04 | -36.0444 | -54.3398 | 0.1199 | 0.3171 | 9.2029 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-10-24 | AS_T01 | -36.0444 | -69.6891 | 1.8464 | 0.0053 | 2.3616 |
| LittleHopeLH1 | 2024-10-24 | AS_T02 | -36.0444 | -39.6479 | 2.9040 | 3.3722 | 2,384.1034 |
| LittleHopeLH1 | 2024-10-24 | AS_T03 | -36.0444 | -39.9537 | 3.4253 | 2.6646 | 2,221.9972 |
| LittleHopeLH1 | 2024-10-24 | AS_T04 | -36.0444 | -66.5992 | 3.6807 | 0.0054 | 4.8105 |
| LittleHopeLH1 | 2024-10-24 | AS_T05 | -36.0444 | -70.2327 | 3.6672 | 0.0023 | 2.0837 |
| LittleHopeLH1 | 2024-10-24 | AS_T06 | -36.0444 | -67.6877 | 3.5702 | 0.0043 | 3.7440 |
| LittleHopeLH1 | 2024-10-24 | AS_T07 | -36.0444 | -66.4979 | 3.3581 | 0.0060 | 4.9240 |
| LittleHopeLH2 | 2024-10-23 | SH_T01 | -36.0444 | -58.3334 | 0.7589 | 0.0760 | 13.9276 |
| LittleHopeLH2 | 2024-10-23 | SH_T02 | -36.0444 | -54.1624 | 1.0024 | 0.1503 | 36.3899 |
| LittleHopeLH2 | 2024-10-23 | SH_T03 | -36.0444 | -56.5248 | 1.3843 | 0.0632 | 21.1222 |
| LittleHopeLH2 | 2024-10-23 | SH_T04 | -36.0444 | -53.5407 | 1.2916 | 0.1346 | 41.9904 |
| LittleHopeLH2 | 2024-10-23 | SH_T05 | -36.0444 | -61.0891 | 1.6682 | 0.0183 | 7.3843 |
| LittleHopeLH2 | 2024-10-23 | SH_T06 | -36.0444 | -55.5907 | 1.3843 | 0.0783 | 26.1909 |
| LittleHopeLH2 | 2024-10-23 | SH_T07 | -36.0444 | -65.6844 | 1.4867 | 0.0071 | 2.5632 |
| LittleHopeLH2 | 2024-10-23 | SH_T08 | -36.0444 | -63.8469 | 0.7908 | 0.0205 | 3.9132 |
| LittleHopeLH3 | 2024-10-24 | SH_T09 | -36.0444 | -31.3545 | 0.3019 | 28.1045 | 1,709.6808 |
| LittleHopeLH3 | 2024-10-24 | SH_T10 | -36.0444 | -31.2372 | 0.4966 | 17.5575 | 1,756.4835 |
| LittleHopeLH3 | 2024-10-24 | SH_T11 | -36.0444 | -31.3443 | 0.5140 | 16.5478 | 1,713.7189 |
| LittleHopeLH3 | 2024-10-24 | SH_T12 | -36.0444 | -62.7027 | 0.5648 | 0.0110 | 1.2534 |
| LittleHopeLH3 | 2024-10-24 | SH_T13 | -36.0444 | -63.5086 | 0.5987 | 0.0086 | 1.0411 |
| LittleHopeLH3 | 2024-10-24 | SH_T14 | -36.0444 | -74.5441 | 0.4061 | 0.0010 | 0.0820 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| LittleHopeLH1 | 2024-11-02 | AS_T01 | -35.7836 | -65.1108 | 1.1097 | 0.0220 | 7.0599 |
| LittleHopeLH1 | 2024-11-02 | AS_T02 | -35.7836 | -62.2888 | 1.1524 | 0.0406 | 13.5206 |
| LittleHopeLH1 | 2024-11-02 | AS_T03 | -35.7836 | -57.0648 | 1.3189 | 0.1180 | 45.0194 |
| LittleHopeLH1 | 2024-11-02 | AS_T04 | -35.7836 | -60.5042 | 1.5401 | 0.0458 | 20.3916 |
| LittleHopeLH1 | 2024-11-02 | AS_T05 | -35.7836 | -55.2591 | 1.4744 | 0.1599 | 68.2282 |
| LittleHopeLH1 | 2024-11-02 | AS_T06 | -35.7836 | -58.4001 | 1.8274 | 0.0626 | 33.1025 |
| LittleHopeLH1 | 2024-11-02 | AS_T07 | -35.7836 | -58.1227 | 1.9342 | 0.0631 | 35.2858 |
| LittleHopeLH1 | 2024-11-02 | AS_T08 | -35.7836 | -66.0406 | 2.0193 | 0.0098 | 5.6992 |
| LittleHopeLH1 | 2024-11-02 | AS_T09 | -35.7836 | -63.7406 | 2.1482 | 0.0156 | 9.6786 |
| LittleHopeLH1 | 2024-11-02 | AS_T10 | -35.7836 | -65.5887 | 2.0139 | 0.0109 | 6.3241 |
| LittleHopeLH1 | 2024-11-02 | AS_T11 | -35.7836 | -65.1618 | 1.8236 | 0.0132 | 6.9774 |
| LittleHopeLH1 | 2024-11-02 | AS_T12 | -35.7836 | -74.5122 | 1.6294 | 0.0017 | 0.8103 |
| LittleHopeLH1 | 2024-11-02 | AS_T13 | -35.7836 | -80.2340 | 0.9074 | 0.0008 | 0.2170 |
| LittleHopeLH2 | 2024-11-02 | SH_T01 | -35.7836 | -53.0160 | 1.8505 | 0.0878 | 75.3900 |
| LittleHopeLH2 | 2024-11-02 | SH_T02 | -35.7836 | -49.6016 | 2.3498 | 0.1518 | 165.4812 |
| LittleHopeLH2 | 2024-11-02 | SH_T03 | -35.7836 | -52.0600 | 2.3988 | 0.0845 | 93.9537 |
| LittleHopeLH2 | 2024-11-02 | SH_T04 | -35.7836 | -72.6902 | 1.9956 | 0.0009 | 0.8126 |
| LittleHopeLH3 | 2024-11-03 | SH_T05 | -35.7836 | -55.7404 | 1.0699 | 0.0931 | 48.6491 |
| LittleHopeLH3 | 2024-11-03 | SH_T06 | -35.7836 | -60.7349 | 0.9668 | 0.0326 | 15.4039 |
| LittleHopeLH3 | 2024-11-03 | SH_T07 | -35.7836 | -52.3350 | 1.4292 | 0.1526 | 106.5659 |
| LittleHopeLH3 | 2024-11-03 | SH_T08 | -35.7836 | -56.4718 | 1.1278 | 0.0746 | 41.1091 |
| LittleHopeLH3 | 2024-11-03 | SH_T09 | -35.7836 | -53.5970 | 1.7782 | 0.0917 | 79.6916 |
| LittleHopeLH3 | 2024-11-03 | SH_T10 | -35.7836 | -57.3494 | 2.2953 | 0.0300 | 33.5873 |
| LittleHopeLH3 | 2024-11-03 | SH_T11 | -35.7836 | -57.9402 | 1.1927 | 0.0503 | 29.3153 |
| LittleHopeLH4 | 2024-11-03 | E8_T01 | -35.7836 | -52.9096 | 0.9385 | 0.1271 | 24.5074 |
| LittleHopeLH4 | 2024-11-03 | E8_T02 | -35.7836 | -49.3875 | 1.1093 | 0.2420 | 55.1450 |
| LittleHopeLH4 | 2024-11-03 | E8_T03 | -35.7836 | -50.3266 | 0.8145 | 0.2655 | 44.4214 |
| LittleHopeLH4 | 2024-11-03 | E8_T04 | -35.7836 | -53.7886 | 0.8427 | 0.1156 | 20.0168 |
| LittleHopeLH4 | 2024-11-03 | E8_T05 | -35.7836 | -52.6659 | 1.0218 | 0.1235 | 25.9214 |
| LittleHopeLH4 | 2024-11-03 | E8_T06 | -35.7836 | -51.1831 | 0.7676 | 0.2313 | 36.4705 |
| LittleHopeLH4 | 2024-11-03 | E8_T07 | -35.7836 | -55.2482 | 0.4906 | 0.1419 | 14.3032 |
| LittleHopeLH4 | 2024-11-03 | E8_T08 | -35.7836 | -66.7668 | 0.1705 | 0.0288 | 1.0083 |
Eastern Shore
Summary
Table. Summary of the 2024 Eastern Shore spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.
| Location | Date | Interval (days) | Target Strength (dB/kg) | Area (km2) | Mean Sa (dB/m2) | Biomass (t) | Standard Error (t) | St. Err % |
|---|---|---|---|---|---|---|---|---|
| Eastern Shore #1 | 2024-09-12 | -35.9475 | 1 | -35.13 | 729 | 292 | 40 | |
| Eastern Shore #2 | 2024-09-24 | 12 | -36.0139 | 20 | -46.33 | 6,832 | 309 | 16 |
| Eastern Shore #3 | 2024-10-04 | 10 | -35.7788 | 11 | -39.84 | 7,799 | 2,851 | 65 |
| Eastern Shore #4 | 2024-10-30 | 26 | -35.8321 | 1 | -49.24 | 32 | 16 | 56 |
| Eastern Shore #5 | 2024-11-04 | 5 | -35.7836 | 0 | -43.44 | 38 | 33 | 86 |
| Summary | 7 | -42.80 | 15,430 | 3,035 | 20 |
Length Frequency
Figure. Length distribution used for calculation of TS for the Eastern Shore acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.
Maturity Samples
Figure. Herring maturity samples collected during Eastern Shore surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.
Target Strength
Table. Summary of 2024 fish sampled for Eastern Shore by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.
| Location of survey | Interval (days) | Date | No. of Len. Samp. | No. of Det. Samp. | No. Len/Wt Fish | No. of Fish Measured | Mean Length (mm) | Mean Weight (g) | Target Strength (dB/kg) | Wt 28 cm Fish (g) | TS 28 cm Fish (dB/kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Eastern Shore #1 | Sep - 12 | 1 | 1 | 20 | 151 | 286 | 187 | -35.4981 | 179 | -35.4776 | |
| Eastern Shore #2 | 12 | Sep - 24 | 7 | 2 | 31 | 916 | 300 | 209 | -35.5644 | 170 | -35.2590 |
| Eastern Shore #3 | 10 | Oct - 4 | 4 | 3 | 64 | 513 | 285 | 179 | -35.3293 | 171 | -35.2909 |
| Eastern Shore #4 | 26 | Oct - 30 | 1 | 1 | 23 | 115 | 295 | 194 | -35.3827 | 170 | -35.2546 |
| Eastern Shore #5 | 6 | Nov - 5 | 2 | 2 | 36 | 133 | 290 | 185 | -35.3341 | 171 | -35.2751 |
NASC Plots
NASC - Nautical Area Scattering Strength
Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Eastern Shore acoustic surveys.
Survey Details
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| EasternShoreES1 | 2024-09-12 | ZP_T01 | -35.9475 | -50.2930 | 1.0353 | 0.2160 | 22.1796 |
| EasternShoreES1 | 2024-09-12 | ZP_T02 | -35.9475 | -39.7825 | 1.2010 | 2.0938 | 249.4644 |
| EasternShoreES1 | 2024-09-12 | ZP_T03 | -35.9475 | -38.8486 | 1.2864 | 2.4238 | 309.3131 |
| EasternShoreES1 | 2024-09-12 | ZP_T04 | -35.9475 | -42.0782 | 1.2778 | 1.1600 | 147.0421 |
| EasternShoreES1 | 2024-09-12 | ZP_T05 | -35.9475 | -63.8044 | 1.2807 | 0.0078 | 0.9881 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| EasternShoreES1 | 2024-09-24 | SB_T01 | -36.0139 | -59.8183 | 3.3325 | 0.0461 | 84.3503 |
| EasternShoreES1 | 2024-09-24 | SB_T02 | -36.0139 | -57.7119 | 3.3167 | 0.0752 | 137.0007 |
| EasternShoreES1 | 2024-09-24 | SB_T03 | -36.0139 | -59.1076 | 3.1391 | 0.0576 | 99.3476 |
| EasternShoreES1 | 2024-09-24 | SB_T04 | -36.0139 | -58.4631 | 2.8991 | 0.0724 | 115.2406 |
| EasternShoreES1 | 2024-09-24 | SB_T05 | -36.0139 | -59.4699 | 2.6880 | 0.0619 | 91.3955 |
| EasternShoreES1 | 2024-09-24 | SB_T06 | -36.0139 | -53.9020 | 6.1746 | 0.0971 | 329.3974 |
| EasternShoreES1 | 2024-09-24 | SB_T07 | -36.0139 | -56.1183 | 4.5569 | 0.0790 | 197.7348 |
| EasternShoreES1 | 2024-09-24 | SB_T08 | -36.0139 | -52.3147 | 4.9732 | 0.1738 | 474.7275 |
| EasternShoreES1 | 2024-09-24 | SB_T09 | -36.0139 | -54.7313 | 2.7763 | 0.1785 | 272.1378 |
| EasternShoreES1 | 2024-09-24 | SB_T10 | -36.0139 | -59.9807 | 3.0249 | 0.0489 | 81.2547 |
| EasternShoreES2 | 2024-09-24 | EA_T04 | -36.0139 | -55.9205 | 0.5779 | 0.0628 | 4.8343 |
| EasternShoreES2 | 2024-09-24 | EA_T03 | -36.0139 | -47.1698 | 0.7203 | 0.3776 | 36.2584 |
| EasternShoreES2 | 2024-09-24 | EA_T02 | -36.0139 | -53.1372 | 1.2393 | 0.0555 | 9.1763 |
| EasternShoreES2 | 2024-09-24 | EA_T01 | -36.0139 | -63.2314 | 1.0120 | 0.0067 | 0.8979 |
| EasternShoreES3 | 2024-09-24 | EA_T05 | -36.0139 | -53.7941 | 0.5766 | 0.1201 | 9.4856 |
| EasternShoreES3 | 2024-09-24 | EA_T06 | -36.0139 | -43.1583 | 0.8738 | 0.9170 | 109.8091 |
| EasternShoreES3 | 2024-09-24 | EA_T07 | -36.0139 | -49.4211 | 0.8494 | 0.2230 | 25.9634 |
| EasternShoreES3 | 2024-09-24 | EA_T08 | -36.0139 | -60.8975 | 0.7475 | 0.0180 | 1.8481 |
| EasternShoreES3 | 2024-09-24 | EA_T09 | -36.0139 | -50.2580 | 0.7502 | 0.2083 | 21.4127 |
| EasternShoreES3 | 2024-09-24 | EA_T10 | -36.0139 | -46.3160 | 0.3542 | 1.0935 | 53.0730 |
| EasternShoreES4 | 2024-09-24 | KK_T02 | -36.0139 | -70.4481 | 0.8224 | 0.0010 | 0.1146 |
| EasternShoreES4 | 2024-09-24 | KK_T03 | -36.0139 | -67.9476 | 0.8643 | 0.0017 | 0.2037 |
| EasternShoreES4 | 2024-09-24 | KK_T01 | -36.0139 | -67.4445 | 0.5908 | 0.0028 | 0.2288 |
| EasternShoreES5 | 2024-09-24 | KK_T13 | -36.0139 | -73.6426 | 0.6555 | 0.0076 | 2.4501 |
| EasternShoreES5 | 2024-09-24 | KK_T12 | -36.0139 | -55.3074 | 2.2760 | 0.1498 | 166.9943 |
| EasternShoreES5 | 2024-09-24 | KK_T11 | -36.0139 | -53.7343 | 2.5037 | 0.1957 | 239.8899 |
| EasternShoreES5 | 2024-09-24 | KK_T10 | -36.0139 | -54.8213 | 2.6483 | 0.1440 | 186.7723 |
| EasternShoreES5 | 2024-09-24 | KK_T09 | -36.0139 | -53.3832 | 2.5697 | 0.2067 | 260.0918 |
| EasternShoreES5 | 2024-09-24 | KK_T08 | -36.0139 | -52.3546 | 3.1478 | 0.2138 | 329.5991 |
| EasternShoreES5 | 2024-09-24 | KK_T07 | -36.0139 | -52.1841 | 2.6052 | 0.2687 | 342.7996 |
| EasternShoreES5 | 2024-09-24 | KK_T06 | -36.0139 | -52.5126 | 4.3363 | 0.1497 | 317.8259 |
| EasternShoreES5 | 2024-09-24 | KK_T05 | -36.0139 | -49.9821 | 4.2505 | 0.2735 | 569.1684 |
| EasternShoreES5 | 2024-09-24 | KK_T04 | -36.0139 | -54.2248 | 3.9918 | 0.1096 | 214.2712 |
| EasternShoreES6 | 2024-09-24 | ZP_T11 | -36.0139 | -71.8060 | 0.4882 | 0.0166 | 2.0524 |
| EasternShoreES6 | 2024-09-24 | ZP_T12 | -36.0139 | -57.7082 | 1.6452 | 0.1269 | 52.7267 |
| EasternShoreES6 | 2024-09-24 | ZP_T13 | -36.0139 | -55.5512 | 1.4494 | 0.2367 | 86.6434 |
| EasternShoreES6 | 2024-09-24 | ZP_T14 | -36.0139 | -56.9102 | 1.5554 | 0.1613 | 63.3624 |
| EasternShoreES6 | 2024-09-24 | ZP_T15 | -36.0139 | -54.1023 | 1.7838 | 0.2685 | 120.9543 |
| EasternShoreES6 | 2024-09-24 | ZP_T16 | -36.0139 | -59.8649 | 1.4220 | 0.0894 | 32.0895 |
| EasternShoreES6 | 2024-09-24 | ZP_T17 | -36.0139 | -55.3984 | 1.3485 | 0.2636 | 89.7458 |
| EasternShoreES6 | 2024-09-24 | ZP_T18 | -36.0139 | -55.4271 | 1.7251 | 0.2047 | 89.1547 |
| EasternShoreES6 | 2024-09-24 | ZP_T19 | -36.0139 | -55.1180 | 1.0650 | 0.3560 | 95.7313 |
| EasternShoreES6 | 2024-09-24 | ZP_T20 | -36.0139 | -53.9816 | 1.1402 | 0.4319 | 124.3619 |
| EasternShoreES6 | 2024-09-24 | ZP_T21 | -36.0139 | -52.1971 | 1.0888 | 0.6822 | 187.5602 |
| EasternShoreES6 | 2024-09-24 | ZP_T22 | -36.0139 | -53.0037 | 1.8022 | 0.3423 | 155.7707 |
| EasternShoreES6 | 2024-09-24 | ZP_T23 | -36.0139 | -51.5512 | 1.4388 | 0.5991 | 217.6372 |
| EasternShoreES6 | 2024-09-24 | ZP_T24 | -36.0139 | -58.6111 | 0.7851 | 0.2160 | 42.8295 |
| EasternShoreES6 | 2024-09-24 | ZP_T25 | -36.0139 | -55.8172 | 0.5122 | 0.6302 | 81.4956 |
| EasternShoreES6 | 2024-09-24 | ZP_T26 | -36.0139 | -60.5664 | 0.4657 | 0.2322 | 27.3029 |
| EasternShoreES6 | 2024-09-24 | ZP_T10 | -36.0139 | -58.1729 | 1.1095 | 0.1691 | 47.3766 |
| EasternShoreES6 | 2024-09-24 | ZP_T09 | -36.0139 | -55.5075 | 1.1688 | 0.2965 | 87.5180 |
| EasternShoreES6 | 2024-09-24 | ZP_T08 | -36.0139 | -59.1020 | 1.2237 | 0.1238 | 38.2519 |
| EasternShoreES6 | 2024-09-24 | ZP_T07 | -36.0139 | -53.0589 | 1.1794 | 0.5165 | 153.8011 |
| EasternShoreES6 | 2024-09-24 | ZP_T06 | -36.0139 | -56.4957 | 1.0950 | 0.2521 | 69.7085 |
| EasternShoreES6 | 2024-09-24 | ZP_T05 | -36.0139 | -56.5851 | 1.1777 | 0.2296 | 68.2880 |
| EasternShoreES6 | 2024-09-24 | ZP_T04 | -36.0139 | -58.3922 | 1.4852 | 0.1201 | 45.0433 |
| EasternShoreES6 | 2024-09-24 | ZP_T03 | -36.0139 | -59.4592 | 1.1008 | 0.1268 | 35.2314 |
| EasternShoreES6 | 2024-09-24 | ZP_T02 | -36.0139 | -60.4324 | 1.0721 | 0.1040 | 28.1585 |
| EasternShoreES6 | 2024-09-24 | ZP_T01 | -36.0139 | -68.9739 | 0.5182 | 0.0301 | 3.9397 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| EasternShoreES1 | 2024-10-04 | SB_T15 | -35.7788 | -76.5831 | 3.1552 | 0.0005 | 0.9251 |
| EasternShoreES1 | 2024-10-04 | SB_T16 | -35.7788 | -49.4107 | 3.4247 | 0.2407 | 482.3931 |
| EasternShoreES1 | 2024-10-04 | SB_T17 | -35.7788 | -40.5595 | 4.7208 | 1.3404 | 3,702.7620 |
| EasternShoreES1 | 2024-10-04 | SB_T18 | -35.7788 | -54.0691 | 4.3533 | 0.0648 | 165.0298 |
| EasternShoreES1 | 2024-10-04 | SB_T19 | -35.7788 | -64.3400 | 3.3716 | 0.0079 | 15.5052 |
| EasternShoreES2 | 2024-10-04 | KK_T02 | -35.7788 | -49.6654 | 0.3698 | 0.1626 | 13.5289 |
| EasternShoreES2 | 2024-10-04 | KK_T01 | -35.7788 | -41.0571 | 0.4277 | 1.0203 | 98.1948 |
| EasternShoreES2 | 2024-10-04 | KK_T03 | -35.7788 | -45.3476 | 0.3254 | 0.4994 | 36.5633 |
| EasternShoreES2 | 2024-10-04 | KK_T04 | -35.7788 | -68.4472 | 0.3484 | 0.0023 | 0.1791 |
| EasternShoreES3 | 2024-10-04 | KK_T05 | -35.7788 | -71.2758 | 1.0984 | 0.0014 | 0.3600 |
| EasternShoreES3 | 2024-10-04 | KK_T06 | -35.7788 | -40.1100 | 1.3509 | 1.4359 | 470.7963 |
| EasternShoreES3 | 2024-10-04 | KK_T07 | -35.7788 | -51.5806 | 1.4397 | 0.0960 | 33.5560 |
| EasternShoreES3 | 2024-10-04 | KK_T08 | -35.7788 | -51.4172 | 1.3696 | 0.1048 | 34.8425 |
| EasternShoreES4 | 2024-10-04 | KK_T12 | -35.7788 | -59.8605 | 0.4621 | 0.0196 | 1.1904 |
| EasternShoreES4 | 2024-10-04 | KK_T11 | -35.7788 | -46.3134 | 0.6359 | 0.3231 | 26.9414 |
| EasternShoreES4 | 2024-10-04 | KK_T10 | -35.7788 | -49.0148 | 0.8718 | 0.1265 | 14.4637 |
| EasternShoreES4 | 2024-10-04 | KK_T09 | -35.7788 | -57.1169 | 0.3537 | 0.0483 | 2.2391 |
| EasternShoreES5 | 2024-10-04 | KK_T16 | -35.7788 | -54.7744 | 0.5527 | 0.0486 | 4.3998 |
| EasternShoreES5 | 2024-10-04 | KK_T15 | -35.7788 | -42.4585 | 0.6967 | 0.6577 | 74.9947 |
| EasternShoreES5 | 2024-10-04 | KK_T14 | -35.7788 | -48.1211 | 0.5069 | 0.2454 | 20.3595 |
| EasternShoreES5 | 2024-10-04 | KK_T13 | -35.7788 | -46.9493 | 0.3771 | 0.4320 | 26.6652 |
| EasternShoreES6 | 2024-10-04 | ZP_T01 | -35.7788 | -74.1903 | 0.8779 | 0.0030 | 0.5772 |
| EasternShoreES6 | 2024-10-04 | ZP_T02 | -35.7788 | -71.1739 | 1.2451 | 0.0042 | 1.1561 |
| EasternShoreES6 | 2024-10-04 | ZP_T03 | -35.7788 | -49.7837 | 1.2383 | 0.5775 | 159.2243 |
| EasternShoreES6 | 2024-10-04 | ZP_T04 | -35.7788 | -44.1069 | 1.2392 | 2.1327 | 588.4198 |
| EasternShoreES6 | 2024-10-04 | ZP_T05 | -35.7788 | -48.9072 | 1.2467 | 0.7020 | 194.8320 |
| EasternShoreES6 | 2024-10-04 | ZP_T06 | -35.7788 | -43.8886 | 1.4555 | 1.9095 | 618.7497 |
| EasternShoreES6 | 2024-10-04 | ZP_T07 | -35.7788 | -46.3552 | 1.5234 | 1.0338 | 350.6341 |
| EasternShoreES6 | 2024-10-04 | ZP_T08 | -35.7788 | -47.4994 | 1.4715 | 0.8224 | 269.4233 |
| EasternShoreES6 | 2024-10-04 | ZP_T09 | -35.7788 | -50.2686 | 1.3419 | 0.4767 | 142.4008 |
| EasternShoreES6 | 2024-10-04 | ZP_T10 | -35.7788 | -51.7731 | 1.1559 | 0.3913 | 100.7077 |
| EasternShoreES6 | 2024-10-04 | ZP_T11 | -35.7788 | -56.3311 | 1.0151 | 0.1560 | 35.2584 |
| EasternShoreES6 | 2024-10-04 | ZP_T12 | -35.7788 | -59.7605 | 1.2123 | 0.0593 | 16.0078 |
| EasternShoreES6 | 2024-10-04 | ZP_T13 | -35.7788 | -54.6959 | 1.2016 | 0.1921 | 51.3788 |
| EasternShoreES6 | 2024-10-04 | ZP_T14 | -35.7788 | -59.8261 | 1.1587 | 0.0611 | 15.7675 |
| EasternShoreES6 | 2024-10-04 | ZP_T15 | -35.7788 | -75.2550 | 0.6019 | 0.0034 | 0.4517 |
| EasternShoreES7 | 2024-10-04 | ZP_T20 | -35.7788 | -61.1484 | 0.8600 | 0.0142 | 2.1765 |
| EasternShoreES7 | 2024-10-04 | ZP_T19 | -35.7788 | -54.6941 | 0.8568 | 0.0628 | 9.6201 |
| EasternShoreES7 | 2024-10-04 | ZP_T18 | -35.7788 | -59.4236 | 0.8993 | 0.0202 | 3.2376 |
| EasternShoreES7 | 2024-10-04 | ZP_T17 | -35.7788 | -54.6016 | 0.9777 | 0.0563 | 9.8271 |
| EasternShoreES7 | 2024-10-04 | ZP_T16 | -35.7788 | -59.6923 | 0.6008 | 0.0284 | 3.0434 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| EasternShoreES1 | 2024-10-30 | KK_T01 | -35.8321 | -76.4915 | 0.7522 | 0.0003 | 0.0535 |
| EasternShoreES1 | 2024-10-30 | KK_T02 | -35.8321 | -56.6730 | 0.6850 | 0.0353 | 5.1294 |
| EasternShoreES1 | 2024-10-30 | KK_T03 | -35.8321 | -50.6106 | 0.8453 | 0.1156 | 20.7162 |
| EasternShoreES1 | 2024-10-30 | KK_T04 | -35.8321 | -59.7913 | 0.6542 | 0.0180 | 2.5017 |
| EasternShoreES2 | 2024-10-30 | ZP_T01 | -35.8321 | -77.1220 | 0.7432 | 0.0004 | 0.0234 |
| EasternShoreES2 | 2024-10-30 | ZP_T02 | -35.8321 | -70.7071 | 0.9788 | 0.0013 | 0.1027 |
| EasternShoreES2 | 2024-10-30 | ZP_T03 | -35.8321 | -68.3246 | 1.0031 | 0.0021 | 0.1777 |
| EasternShoreES2 | 2024-10-30 | ZP_T04 | -35.8321 | -55.8462 | 1.0727 | 0.0353 | 3.1442 |
| Location | Date | Transect Number | Target Strength (dB/kg) | Mean Sa (dB/m^2) | Distance (km) | Biomass Density kg/m^2 | Biomass (t) |
|---|---|---|---|---|---|---|---|
| EasternShoreES1 | 2024-11-04 | KK_T04 | -35.7836 | -73.2067 | 0.4150 | 0.0007 | 0.0402 |
| EasternShoreES1 | 2024-11-04 | KK_T03 | -35.7836 | -72.5397 | 0.5302 | 0.0007 | 0.0468 |
| EasternShoreES1 | 2024-11-04 | KK_T02 | -35.7836 | -43.4506 | 0.4865 | 0.5934 | 37.9626 |
| EasternShoreES1 | 2024-11-04 | KK_T01 | -35.7836 | -92.4599 | 0.2554 | 0.0000 | 0.0005 |
Notes
About
This report was generated on: 2025-07-28 11:03:49.507063
dplyr
R package version 1.1.4
kableExtra R package version 1.4.0
ggplot2 R package version 3.5.1
DT R package version 0.33
R
version 4.4.2 (2024-10-31 ucrt)